On this day, October 14th,1949 eleven leaders of the American Communist Party are convicted after a nine-month trial in a Federal District Court. They are convicted of conspiring to advocate the violent overthrow of the U.S. Federal Government. The Communist Party USA (CPUSA) is a Marxist political party in the United States, established in 1919. It has a long, complex history that is closely related to the histories of similar communist parties worldwide and the U.S. labor movement. Headquarters are located at 235 W. 23rd st in New York, New York.