1927

Shanghai massacre

Kuomintang forces and allied gangs attack Shanghai's Communist-led labor movement

The first attackers wore workers' blue clothing and armbands bearing the character for "labour" — while assaulting actual union offices.

Before dawn, in borrowed clothes

Before dawn on 12 April 1927, more than 1,000 armed Kuomintang men wearing blue labourers' clothing and armbands marked with the character for labour attacked Shanghai General Labor Union offices around the Chinese-administered parts of the city.

National Revolutionary Army troops then arrived ostensibly to mediate, demanded that the union militias surrender their weapons, and opened fire when workers resisted disarmament.

Union leaders were seized as Chiang Kai-shek's conservative Kuomintang faction moved to destroy the CCP-organised labour movement that had helped take the Chinese city from warlord forces in March.

Party, army, business and the Green Gang

The operation combined party, military, business and organised-crime power. Shanghai underworld networks including the Green Gang, with figures such as Du Yuesheng, cooperated with Chiang's faction against the radical unions — gangs that had previously cooperated with parts of the labour movement.

One scholarly synthesis reports about 300 deaths in the 12 April attacks. The union called a strike and protest for the next day; troops fired into the demonstrators, killing at least 100 and wounding several hundred.

That synthesis places 27th Army troops in the 12 April disarmament and 26th Army troops in the 13 April shooting, where shorter accounts assign the whole operation to the 26th Army.

Where the listing overreaches

The First United Front did not end that morning. The left-KMT government at Wuhan continued cooperating with Communists until the crisis of July 1927, so the alliance's endpoint is not simply 12 April — and the front itself was sealed at the KMT congress of January 1924, not in 1923.

Nor did an uninterrupted civil war begin here. The Chinese Civil War is conventionally dated to 1927, often specifically to the Nanchang Uprising of 1 August, and major KMT–CCP hostilities were later interrupted by the wartime alliance against Japan.

Casualty totals vary sharply because sources count different time spans, locations and categories — killed, wounded, executed, arrested or missing.

Sources

Researched 24 Aug 2026 5 sources not yet audited Date corrected

How this was checked

Researched from the web into a fact sheet and rewritten from that sheet. This article has not yet had an independent model audit. How the pipeline works →

Date corrected. The research places this at 1927-04-12.

What the sources leave uncertain

The date and basic sequence are secure, but casualty totals vary sharply because sources count different time spans, locations and categories—killed, wounded, executed, arrested or missing.
A scholarly synthesis identifies 27th Army troops in the 12 April disarmament and 26th Army troops in the 13 April shooting. Many shorter accounts assign the entire operation to the 26th Army.
The Shanghai purge gravely ruptured the alliance, but the left-KMT government at Wuhan continued cooperating with Communists until the crisis of July 1927. The exact endpoint of the First United Front is therefore not simply 12 April.
The Chinese Civil War is conventionally dated to 1927, often specifically to the Nanchang Uprising of 1 August. Calling the Shanghai massacre itself the first battle of one uninterrupted war through 1949 compresses a disputed and intermittent chronology.