Joseph Zack Kornfeder ( 1898 – 1963 ) , AKA Joseph Zack , as " Joe " to friends , and sometimes surnamed " Kornfedder " in the press , was an Austro-Hungarian-born American who was a founding member and top leader of the Communist Party of America in 1919 , Communist Party USA leader , and Comintern representative to South America ( 1930-1931 ) before quitting the Party in 1934 . After his wife was arrested by the secret police during the Great Terror ( 1937-1938 ) , Zack became a vehement Anti-Communist and testified before the Dies Committee ( 1939 ) and Canwell Committee ( 1948 )
Great Terror
Great Purge
Joseph Zack Kornfeder