Twentieth Century

Introduction

The 20th century saw human trafficking operate on an industrial scale during wartime and persist in various forms through decades of decolonization, Cold War politics, and economic globalization. Two world wars produced massive forced labor systems, and the postwar period saw trafficking evolve in response to new geopolitical realities. International law slowly developed frameworks to address exploitation, but enforcement remained inconsistent and the concept of “trafficking” as a distinct crime category did not fully crystallize until the century’s end.

World War II Forced Labor

Nazi Forced Labor Program

The Nazi regime operated the most extensive forced labor system in modern European history. By 1944, an estimated 7.6 million foreign civilian workers and prisoners of war were performing forced labor in the German war economy. This included concentration camp inmates, prisoners of war, and civilians deported from occupied territories.

Forced laborers worked in arms factories, mines, construction projects, and agricultural operations. Major German corporations, including I.G. Farben, Krupp, Siemens, and Volkswagen, utilized forced labor extensively. Conditions were deliberately lethal in many cases, particularly for concentration camp inmates assigned to projects like the V-2 rocket production at the Mittelwerk underground factory, where an estimated 20,000 forced laborers died.

The International Military Tribunal at Nuremberg (1945–1946) prosecuted the use of forced labor as a war crime and a crime against humanity, establishing a precedent that would influence later anti-trafficking law. Fritz Sauckel, the Nazi official responsible for the forced labor program, was convicted and executed.

Japanese “Comfort Women” System

The Imperial Japanese military operated a system of sexual slavery euphemistically called “comfort stations” throughout its occupied territories from 1932 to 1945. An estimated 50,000 to 200,000 women, predominantly from Korea, China, the Philippines, and other occupied nations, were forced or coerced into sexual servitude at military brothels.

Women were recruited through deception (false promises of factory employment), direct abduction, or coercion by local authorities under Japanese direction. Once confined to comfort stations, they were subjected to repeated sexual assault by soldiers, with no ability to leave. Many did not survive; those who did suffered lifelong physical and psychological trauma.

The comfort women system was not publicly acknowledged by the Japanese government until the 1990s, when surviving victims in South Korea began speaking publicly. The 1993 Kono Statement offered the first official Japanese acknowledgment, and a 2015 agreement between Japan and South Korea addressed compensation; though many survivors and advocacy groups rejected the agreement as insufficient.

Soviet Forced Labor: The Gulag System

The Soviet Gulag system, a network of forced labor camps operating from the 1930s through the 1950s, held an estimated 18 million people over its existence. While the Gulag is primarily understood as a political repression system, it also functioned as a massive forced labor operation that built infrastructure, mined resources, and produced goods for the Soviet economy.

Prisoners were transported across vast distances to remote labor camps in Siberia, Central Asia, and the Arctic. They worked in gold mines, timber operations, canal construction, and railway building under conditions of extreme cold, malnutrition, and brutality. An estimated 1.5–1.8 million people died in the Gulag system.

The forced labor component of the Gulag, the economic exploitation of transported, captive populations, meets modern definitions of trafficking, though it is typically categorized as political repression in historical analysis.

Post-War International Law Development

Universal Declaration of Human Rights (1948)

Article 4 of the Universal Declaration of Human Rights states: “No one shall be held in slavery or servitude; slavery and the slave trade shall be prohibited in all their forms.” While non-binding, the Declaration established slavery prohibition as a fundamental human right recognized by the international community.

The 1949 Convention

The Convention for the Suppression of the Traffic in Persons and of the Exploitation of the Prostitution of Others (1949) was the first post-war international treaty specifically addressing trafficking. It consolidated earlier treaties (1904, 1910, 1921, 1933) and committed signatories to punishing those who trafficked persons for sexual exploitation.

The 1949 Convention had significant limitations:

• It focused exclusively on trafficking for sexual exploitation, ignoring labor trafficking
• It conflated trafficking with prostitution, treating all sex work as exploitation regardless of consent
• It lacked enforcement mechanisms
• Relatively few nations ratified it (82 as of 2024, compared to 190 for the later Palermo Protocol)

Supplementary Convention on Slavery (1956)

The 1956 Supplementary Convention expanded the definition of slavery to include debt bondage, serfdom, forced marriage, and the exploitation of children. This was a significant conceptual advance, recognizing that slavery-like practices could exist without formal legal ownership of persons. The convention laid groundwork for the broader trafficking definitions that would emerge decades later.

Cold War Era Trafficking

Military-Related Trafficking

Cold War military deployments created demand for sexual services around military bases, fueling trafficking networks in Southeast Asia, South Korea, the Philippines, and elsewhere. The presence of US military bases in Thailand, the Philippines, and South Korea was associated with large-scale sex industries that included trafficking victims.

During the Vietnam War, the US military’s “rest and recreation” program generated demand that trafficking networks exploited. Cities like Bangkok, Manila, and Pattaya developed sex tourism industries that originated in military-related demand and persisted long after troop withdrawals.

Proxy Wars & Displacement

Cold War proxy conflicts in Central America, Southeast Asia, sub-Saharan Africa, and Afghanistan displaced millions of people, creating populations vulnerable to trafficking. Refugee camps, weakened state institutions, and wartime economies all created conditions that traffickers exploited. Child soldiers, a form of trafficking involving the forced recruitment of minors into armed conflict, were widespread in conflicts in Mozambique, Uganda, Sierra Leone, and elsewhere.

Post-Colonial Exploitation

Decolonization did not automatically end forced labor in former colonies. In many newly independent nations, colonial economic structures, including systems of coerced labor, persisted under local control. Debt bondage in South Asia, forced labor in agricultural sectors across Africa, and exploitative labor migration from former colonies to former colonial powers continued throughout the post-colonial period.

Bonded Labor in South Asia

Bonded labor, in which workers are trapped by debt owed to employers or landlords, persisted across South Asia despite legal prohibitions. India’s Bonded Labour System (Abolition) Act of 1976 criminalized the practice, but enforcement was minimal. The International Labour Organization estimated that bonded labor affected millions of workers in India, Pakistan, and Nepal through the late 20th century.

Gulf State Labor Migration

The oil boom of the 1970s created massive labor demand in Persian Gulf states, drawing millions of migrant workers from South and Southeast Asia. The kafala (sponsorship) system, under which migrant workers’ legal status was tied to their employer, created structural conditions for exploitation still prevalent in the Middle East today. Workers who experienced abuse, wage theft, or dangerous conditions could not change employers or leave the country without employer consent; conditions that anti-trafficking advocates have identified as constituting forced labor.

Emerging Awareness

By the late 1980s, several developments were converging to produce the modern anti-trafficking movement:

• The fall of the Berlin Wall (1989): The collapse of communist regimes in Eastern Europe created new migration patterns and new trafficking routes.
• Globalization: Increasing ease of international travel and communication facilitated trafficking networks.
• The feminist movement: Advocacy against sexual violence brought new attention to sex trafficking.
• The children’s rights movement: The 1989 UN Convention on the Rights of the Child specifically addressed trafficking, sale, and exploitation of children.
• NGO growth: Organizations like Anti-Slavery International (founded 1839, the world’s oldest human rights organization) and newer groups gained visibility.

These developments set the stage for the watershed moment in anti-trafficking law: the Palermo Protocol of 2000, discussed in the next chapter.

Assessment: A Century of Contradiction

The 20th century was simultaneously the era of the greatest anti-slavery legal advances and some of the most extensive forced labor systems in human history. The Nuremberg Tribunal prosecuted forced labor as a crime against humanity while the Soviet Union operated the Gulag. The Universal Declaration of Human Rights proclaimed freedom from slavery while bonded labor trapped millions in South Asia. The 1949 Convention addressed sex trafficking while Cold War military deployments fueled it.

This contradiction, between legal prohibition and practical persistence, defines the modern trafficking challenge. The next chapter examines how the international community finally began to confront this gap in the 1990s.