The Communist Party USA has held thirty-two official conventions including nomination conventions and conventions held while the party was known as the Workers Party of America, the Workers (Communist) Party of America and the Communist Political Association. There were also a number of congresses held by the earlier (though often underground) organizational predecessors of the party, including the Communist Labor Party of America, the United Communist Party and two groups known as the Communist Party of America. The Communist Party's 31st National Convention took place in Chicago from June 13 to 15 in 2019.

Left-wing conference

A resolution for a national conference of left leaning organizations within the Socialist Party of America had been adopted by the Boston local in May 1919 and endorsed by a number of other locals. Admittance as left-wing was defined as endorsement of the left-wing program adopted by the Left Wing Section of Greater New York. When the conference met the delegates divided between a group around the periodical The Revolutionary Age that wanted to infiltrate the Socialist Party's convention in Chicago that September and those who wished to create a Communist Party immediately. The minority withdrew and formed the National Organization Committee for a Communist Party. This group was mainly made up of the suspended language federations and the Socialist Party of Michigan. The majority formed a national left-wing council and attempted to arrange a take over of the Socialist Party's convention. However, by late August the majority decided to forgo this plan and joined with the National Organization Committee to create a new party at a convention in Chicago. A minority, led by Ben Gitlow and John Reed split with the majority and attempted to infiltrate the Socialist Party convention alone.

Communist Party of America (1919)

Communist Labor Party/United Communist Party

Communist Party of America (1921)

Workers Party of America

Workers (Communist) Party of America

Communist Party USA

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