Colonial Council elections were held in French Cochinchina on 16 April 1939.
Cochinchinese parliamentary election, 1939 Wikipedia
The 24 members of the Colonial Council consisted of ten members elected by French citizens, ten by Vietnamese who were classed as French subjects, two by the Chamber of Commerce and two by the Chamber of Agriculture.
Amongst the Vietnamese electorate, three Trotskyist candidates Tạ Thu Thâu, Tran Van Thach and Phan Văn Hùm received around 80% of the vote; the pro-French Constitutionalist Party received 15% and Stalinists candidates 1%.
The defeat of the Stalinism led to the Indochinese Communist Party splitting, with Duong Bach Mai continuing to lead the official faction of the party and Nguyen Van Tao heading a breakaway.