1924 Workers National Convention

In 1924, the Workers Party of America (the "overground" political wing of Communist Party USA) held a convention where it nominated its first-ever presidential ticket. The nomination of a Communist ticket was motivated by the Communist's dissatisfaction with the campaign of Robert M. La Follette that many other leftist political movements had jointly nominated.

Source: Wikipedia — 1924 Workers National Convention (CC BY-SA 4.0)