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      • 2017 Summer Showcase & Fundraiser
  • Books
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    • Supplementary Research Guides >
      • Unit 731 - Guide >
        • Background of Biochemical Warfare Development
        • Imperial Japan's Chemical Warfare Development Program
        • Map of Unit 731
        • Personnel of Unit 731
        • Duties of Unit 731
        • Human Experimentation
        • [GRAPHIC] Germ Warfare Attacks
        • Cover Ups After the War
        • [OLD] Cover Ups After the War
      • Philippines' Resistance - Guide >
        • Philippines World War II Timeline
        • The Japanese Invasion & Conquest of the Philippines
        • Bataan Death March
        • Formation of Underground Philippines Resistance
        • Supplies of the Guerrilla Fighters
        • The Hukbalahap
        • Hunter's ROTC
        • Marking's Guerrillas
        • United States Army Forces in the Philippines of Northern Luzon (USAFIP-NL)
        • The Aetas
        • Chinese and Filipino-Chinese Nationalist Guerrilla Units
        • The Female Faces of the Philippine Guerrillas
      • Rising Sun Flag - Guide >
        • History of the Rising Sun Flag
        • Atrocities Committed Under the Flag
        • Rising Sun Flag in Pop Culture
      • Pinay Guerrilleras - Guide >
        • Japanese Occupation of the Philippine Islands: Pinays Answering the Call to Arms
        • The Fierce Heneralas and Kumanders of the Hukbalahap Guerrillas
        • Amazons of the Pacific Theater
        • Filipina American Veterans: Recovering the Extraordinary Feats of the Ordinary Pinays
        • The Legacy of the Asian Women Soldier
      • Fall of Singapore - Guide >
        • Singapore World War II Timeline
        • History of World War II in the Pacific
        • History of Singapore
        • Japan's Conquest in Asia
        • Japan's Invasion of the Malay Peninsula
        • Sook Ching Massacre
        • Double Tenth Incident
        • Social Changes and Challenges in Singapore
        • Voices from Syonan
        • Return to British Rule
      • Three Years and Eight Months - Guide >
        • Hong Kong before WW2
        • Buildup to World War 2
        • The Battle of Hong Kong
        • Life during 3 Years and 8 Months
        • East River Column Guerrilla Fighters
        • Prisoners of War Camps
        • End of Japanese Occupation
        • War Crimes Trials
      • Siamese Sovereignty - Guide >
        • The Land of Smiles
        • The Thai-Japanese Relationship
        • Phibun’s Domestic and International Policies
        • The Free Thai Resistance Movement
        • Post WW2 Aftermath of Thailand
      • The Khabarovsk War Crimes Trial - Guide >
        • Defendants of Khabarovsk War Crime
        • The Japanese Empire and USSR in WW2
        • The Employment of the Bacteriological Weapon in the War
        • Planning of Japan invasion to USSR
      • Unit 731 Cover-up : The Operation Paperclip of the East - Guide >
        • Establishing Manchukuo
        • The Development of Unit 731
        • Plan Kantokuen and Bacteriological Warfare
        • The Downfall of the Japanese WW2 Era
        • Three Stages of Interrogations
        • Lasting Impacts
      • Marutas of Unit 731 - Guide >
        • How did Ishii Shiro start unit 731?
        • A Beta Testing Site
        • Establishing Pingfan
        • Experiences at the Human Experimentation Complex
        • Vivisection at the Unit 731
        • Anta Testing Grounds
        • Overall Advance from the Laboratory Creations
        • The End of the War
      • Prince Konoe Memoir - Guide >
        • Who is Prince Konoe?
        • Preparation to Tripartite Pact
        • Emperor Hirohito and Prince Konoe
        • The End of Prince Konoe
      • Competing Empires in Burma - Guide >
        • What was the China-Burma-India Theater?
        • When did the China-Burma-India Theater Happen?
        • Who Fought in the China-Burma-India Theater?
        • The Second Sino Japanese War
        • Japan in the South
        • Operation U-Go
      • Battle of Shanghai - Guide >
        • The Battle of Shanghai. Background
        • Shanghai Before War
        • The First Battle of Shanghai 1932
        • Battle of Shanghai 1937
        • Aftermath of Battle for Shanghai
      • Ishi Shiro - Guide >
        • History of Biological Weapons and The Young Ishii Shiro
        • Establishment in Manchuria
        • Pingfang District - Harbin
        • Failures and Corruption
        • Post War
      • Taiwan The Israel of the East - Guide >
        • Background of Formosa
        • Industrialization of Japan
        • China During WWII
        • Taiwan under Kuomintang
        • New Taiwanese National Identity
      • Seeking Justice for Biological Warfare Victims of Unit 731 - Guide >
        • Introduction of Wang Xuan
        • Colonel Memorandum
        • The Beginning of Biological Warfare
        • The Bacteriological Warfare on China
        • Victims in Zhejiang’s Testimonies
        • After the War
      • Rice and Revolution - Guide >
        • The French Colonial Period
        • Anti-Colonial Resistance
        • The Rise of the Communist Movement
        • Imperial Japan’s Entry into Indochina
        • The Portents of Famine
        • The Famine (1944-45)
        • Legacy of the 1944-45 Vietnam Famine
      • Clash of Empires - Guide >
        • Japan’s Imperialist Origins
        • Japan’s Competition against the West: Nanshin-ron and Hokushin-ron
        • Japanese Imperialism Through the Lens of French Indochina
        • The U.S.-Japan Relations and the Pearl Harbor Attack
      • Hunger for Power and Self-SufficiencyI - Guide >
        • The Influence of War Rations on Post-War Culinary Transformations
        • How World War II Complicated Food Scarcity and Invention
        • American Military Innovations
        • Government-Sponsored Food Inventions in Europe during World War II
        • Feeding the Army: The Adaptation of Japanese Military Cuisine and Its Impact on the Philippines
        • Mixed Dishes: Culinary Innovations Driven by Necessity and Food Scarcity
      • Denial A Quick Look of History of Comfort Women and Present Days’ Complication - Guide >
        • The Comfort Women System and the Fight for Recognition
        • The Role of Activism and International Pressure
        • The Controversy over Japanese History Textbooks
        • The Sonyŏsang Statue and the Symbolism of Public Memorials
        • Activism and Support from Japanese Citizens
        • The Future of Comfort Women Memorials and Education
      • Echoes of Empire: The Power of Japanese Propaganda - Guide >
        • Brief Overview of Imperial Japan
        • Defining Propaganda
        • Propaganda Encouraging Action​
        • The Rise of Nationalism
        • The Formation of Japanese State Propaganda
        • Youth and Education
      • Shadows of the Rising Sun: The Black Dragon Society and the Dawn of Pan-Asianism - Guide >
        • Origins of the Black Dragon Society
        • The Influence of Pan-Asianism
        • Relationship with Sun Yat-sen
        • The Role in Southeast Asia
        • The Spread of Ideology and Espionage
        • Disbandment and Legacy
      • Chongqing Bombing: The Forgotten Blitz of Asia and Its Lasting Impact - Guide >
        • Introduction and Historical Background
        • The Class Divide During the Bombings
        • Resilience and Unity of Chongqing
        • Key Incidents - Great Tunnel Massacre
        • The Aftermath of the Bombings
        • Legacy and Commemoration
      • Shanghai's International Zone: A Nexus of War, Intelligence, and Survival - Guide >
        • Historical Background
        • The International Zone
        • Battles in Shanghai
        • Civilian Intelligence Efforts
        • Wartime Brutality
        • Aftermath & Legacy
    • Lesson Plans >
      • Reparations
      • Ethics in Science
      • Writing the Narrative of a Pinay Fighter
      • Privilege Journal
      • Environmental Injustices
      • Female Guerrillas
      • Hunter's ROTC
      • Scientific Advancements
      • Seeking Justice: A Humanities Lesson Plan
      • The Hukbalahap
      • Trading Immunity
      • Bataan Death March
      • Biochemical Warfare Development
  • History Remembered
Contribute

Civilian Intelligence Efforts

Prominent Families


Two Baghdadi‑Jewish dynasties, the Sassoon and Kadoorie families, held great sway in Shanghai’s commercial life. They first fled persecution in Baghdad decades earlier, made fortunes in India, and then established themselves in China. The Sassoons ran major opium and trading companies, while the Kadoories invested in hotels, power plants, and agriculture. Their grand properties on the Bund, like the Cathay and Palace Hotels, became hubs for socializing and political deal‑making. 

Although they were not formal intelligence agencies, these families gathered valuable information through their extensive networks—employing private agents, local staff, and business liaisons who mingled with officials, diplomats, and visiting military officers. When tensions escalated in the 1930s, their behind‑the‑scenes intelligence likely helped keep civilians safer and aided the city’s resilience. Their philanthropic reach extended to new refugee arrivals, providing a semblance of stability amid Shanghai’s upheaval. 


The
EZRA & MASOUDA SASSOON and family, Baghdad, 1919.

European Refugee Contributions

After Hitler’s rise to power, increasing numbers of Jewish refugees arrived in Shanghai. Many had professional backgrounds—lawyers, academics, doctors—or language skills critical for decoding messages and interpreting foreign broadcasts. Though not always formally recruited by Allied intelligence (like the well‑known “Ritchie Boys” in the European theater), they indirectly contributed through volunteer groups or by sharing observations from the city’s cosmopolitan quarters. 

Local philanthropic committees, often chaired by established Jewish families, circulated essential information about employment and housing. The intermingling of so many cultures and languages in the International Settlement created an unintentional intelligence gold mine, as Allied or neutral citizens communicated about troop movements, distribution of supplies, and the evolving attitudes of foreign consulates. In some cases, passing remarks in café discussions or charitable gatherings ended up being reported—informally—to Allied contacts monitoring Japanese expansion. 

Picture
Lucie Harwich, principal of the Shanghai Jewish Youth Association School, in the Shanghai Ghetto.

Related Book

Picture

Shanghai's International Zone: A Nexus of War, Intelligence, and Survival - Guide

Shanghai's International Zone: A Nexus of War, Intelligence, and Survival dives into the heart of one of history's most contested cities. Through a turbulent blend of diplomacy, espionage, and urban warfare, this book captures Shanghai's transformation into a pivotal battleground during the Asia-Pacific War. From its intricate intelligence networks and the unique role of its foreign population to the bravery of civilians enduring a months-long siege, Shanghai's International Zone offers a sweeping account of resilience amidst the devastation. Discover how Shanghai became both a refuge and a battlefield, where the lines between ally and enemy blurred in a relentless fight for survival.

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Battles in Shanghai

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Wartime Brutality

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  • Home
    • About >
      • FAQ's - Frequently Asked Questions
    • Support Us >
      • Projects you can support! >
        • Distributing Books
        • Presenting at 112th Annual Meeting of Pacific Coast Branch
        • Summer Research Relocation Fund
    • Contact
  • Stories
    • Videos >
      • Black Hearts (2021)
    • Blog
    • Podcast: Forgotten History
  • Internship
    • Summer 2025 Internship
    • Spring 2025 Internship
    • Summer 2024 Internship
    • Summer 2023 Internship
    • Fall 2022 Internship
    • Summer 2022 Internship
    • Summer 2021 Internship
    • Fall 2020- Spring 2021 Internship
    • Summer 2020 Internship
    • Fall 2019 Internship
    • Summer 2019 Internship >
      • Public History Night
    • School Year 2018-2019 Internship
    • Summer 2018 Internship >
      • 2018 Summer Showcase + Fundraiser
    • Fall 2017 Internship
    • Summer 2017 Internship >
      • 2017 Summer Showcase & Fundraiser
  • Books
  • Archives
  • Resource Page
    • Supplementary Research Guides >
      • Unit 731 - Guide >
        • Background of Biochemical Warfare Development
        • Imperial Japan's Chemical Warfare Development Program
        • Map of Unit 731
        • Personnel of Unit 731
        • Duties of Unit 731
        • Human Experimentation
        • [GRAPHIC] Germ Warfare Attacks
        • Cover Ups After the War
        • [OLD] Cover Ups After the War
      • Philippines' Resistance - Guide >
        • Philippines World War II Timeline
        • The Japanese Invasion & Conquest of the Philippines
        • Bataan Death March
        • Formation of Underground Philippines Resistance
        • Supplies of the Guerrilla Fighters
        • The Hukbalahap
        • Hunter's ROTC
        • Marking's Guerrillas
        • United States Army Forces in the Philippines of Northern Luzon (USAFIP-NL)
        • The Aetas
        • Chinese and Filipino-Chinese Nationalist Guerrilla Units
        • The Female Faces of the Philippine Guerrillas
      • Rising Sun Flag - Guide >
        • History of the Rising Sun Flag
        • Atrocities Committed Under the Flag
        • Rising Sun Flag in Pop Culture
      • Pinay Guerrilleras - Guide >
        • Japanese Occupation of the Philippine Islands: Pinays Answering the Call to Arms
        • The Fierce Heneralas and Kumanders of the Hukbalahap Guerrillas
        • Amazons of the Pacific Theater
        • Filipina American Veterans: Recovering the Extraordinary Feats of the Ordinary Pinays
        • The Legacy of the Asian Women Soldier
      • Fall of Singapore - Guide >
        • Singapore World War II Timeline
        • History of World War II in the Pacific
        • History of Singapore
        • Japan's Conquest in Asia
        • Japan's Invasion of the Malay Peninsula
        • Sook Ching Massacre
        • Double Tenth Incident
        • Social Changes and Challenges in Singapore
        • Voices from Syonan
        • Return to British Rule
      • Three Years and Eight Months - Guide >
        • Hong Kong before WW2
        • Buildup to World War 2
        • The Battle of Hong Kong
        • Life during 3 Years and 8 Months
        • East River Column Guerrilla Fighters
        • Prisoners of War Camps
        • End of Japanese Occupation
        • War Crimes Trials
      • Siamese Sovereignty - Guide >
        • The Land of Smiles
        • The Thai-Japanese Relationship
        • Phibun’s Domestic and International Policies
        • The Free Thai Resistance Movement
        • Post WW2 Aftermath of Thailand
      • The Khabarovsk War Crimes Trial - Guide >
        • Defendants of Khabarovsk War Crime
        • The Japanese Empire and USSR in WW2
        • The Employment of the Bacteriological Weapon in the War
        • Planning of Japan invasion to USSR
      • Unit 731 Cover-up : The Operation Paperclip of the East - Guide >
        • Establishing Manchukuo
        • The Development of Unit 731
        • Plan Kantokuen and Bacteriological Warfare
        • The Downfall of the Japanese WW2 Era
        • Three Stages of Interrogations
        • Lasting Impacts
      • Marutas of Unit 731 - Guide >
        • How did Ishii Shiro start unit 731?
        • A Beta Testing Site
        • Establishing Pingfan
        • Experiences at the Human Experimentation Complex
        • Vivisection at the Unit 731
        • Anta Testing Grounds
        • Overall Advance from the Laboratory Creations
        • The End of the War
      • Prince Konoe Memoir - Guide >
        • Who is Prince Konoe?
        • Preparation to Tripartite Pact
        • Emperor Hirohito and Prince Konoe
        • The End of Prince Konoe
      • Competing Empires in Burma - Guide >
        • What was the China-Burma-India Theater?
        • When did the China-Burma-India Theater Happen?
        • Who Fought in the China-Burma-India Theater?
        • The Second Sino Japanese War
        • Japan in the South
        • Operation U-Go
      • Battle of Shanghai - Guide >
        • The Battle of Shanghai. Background
        • Shanghai Before War
        • The First Battle of Shanghai 1932
        • Battle of Shanghai 1937
        • Aftermath of Battle for Shanghai
      • Ishi Shiro - Guide >
        • History of Biological Weapons and The Young Ishii Shiro
        • Establishment in Manchuria
        • Pingfang District - Harbin
        • Failures and Corruption
        • Post War
      • Taiwan The Israel of the East - Guide >
        • Background of Formosa
        • Industrialization of Japan
        • China During WWII
        • Taiwan under Kuomintang
        • New Taiwanese National Identity
      • Seeking Justice for Biological Warfare Victims of Unit 731 - Guide >
        • Introduction of Wang Xuan
        • Colonel Memorandum
        • The Beginning of Biological Warfare
        • The Bacteriological Warfare on China
        • Victims in Zhejiang’s Testimonies
        • After the War
      • Rice and Revolution - Guide >
        • The French Colonial Period
        • Anti-Colonial Resistance
        • The Rise of the Communist Movement
        • Imperial Japan’s Entry into Indochina
        • The Portents of Famine
        • The Famine (1944-45)
        • Legacy of the 1944-45 Vietnam Famine
      • Clash of Empires - Guide >
        • Japan’s Imperialist Origins
        • Japan’s Competition against the West: Nanshin-ron and Hokushin-ron
        • Japanese Imperialism Through the Lens of French Indochina
        • The U.S.-Japan Relations and the Pearl Harbor Attack
      • Hunger for Power and Self-SufficiencyI - Guide >
        • The Influence of War Rations on Post-War Culinary Transformations
        • How World War II Complicated Food Scarcity and Invention
        • American Military Innovations
        • Government-Sponsored Food Inventions in Europe during World War II
        • Feeding the Army: The Adaptation of Japanese Military Cuisine and Its Impact on the Philippines
        • Mixed Dishes: Culinary Innovations Driven by Necessity and Food Scarcity
      • Denial A Quick Look of History of Comfort Women and Present Days’ Complication - Guide >
        • The Comfort Women System and the Fight for Recognition
        • The Role of Activism and International Pressure
        • The Controversy over Japanese History Textbooks
        • The Sonyŏsang Statue and the Symbolism of Public Memorials
        • Activism and Support from Japanese Citizens
        • The Future of Comfort Women Memorials and Education
      • Echoes of Empire: The Power of Japanese Propaganda - Guide >
        • Brief Overview of Imperial Japan
        • Defining Propaganda
        • Propaganda Encouraging Action​
        • The Rise of Nationalism
        • The Formation of Japanese State Propaganda
        • Youth and Education
      • Shadows of the Rising Sun: The Black Dragon Society and the Dawn of Pan-Asianism - Guide >
        • Origins of the Black Dragon Society
        • The Influence of Pan-Asianism
        • Relationship with Sun Yat-sen
        • The Role in Southeast Asia
        • The Spread of Ideology and Espionage
        • Disbandment and Legacy
      • Chongqing Bombing: The Forgotten Blitz of Asia and Its Lasting Impact - Guide >
        • Introduction and Historical Background
        • The Class Divide During the Bombings
        • Resilience and Unity of Chongqing
        • Key Incidents - Great Tunnel Massacre
        • The Aftermath of the Bombings
        • Legacy and Commemoration
      • Shanghai's International Zone: A Nexus of War, Intelligence, and Survival - Guide >
        • Historical Background
        • The International Zone
        • Battles in Shanghai
        • Civilian Intelligence Efforts
        • Wartime Brutality
        • Aftermath & Legacy
    • Lesson Plans >
      • Reparations
      • Ethics in Science
      • Writing the Narrative of a Pinay Fighter
      • Privilege Journal
      • Environmental Injustices
      • Female Guerrillas
      • Hunter's ROTC
      • Scientific Advancements
      • Seeking Justice: A Humanities Lesson Plan
      • The Hukbalahap
      • Trading Immunity
      • Bataan Death March
      • Biochemical Warfare Development
  • History Remembered
Contribute