J. Peters was the most commonly known pseudonym of a man who last went by the name "Alexander Stevens" in 1949. Peters was a journalist, political activist, and accused Soviet spy who was a leading figure of the Hungarian language section of the Communist Party USA in the 1920s and 1930s. From the early 1930s, Peters was actively involved in the espionage activities of the Soviet Union in the United States, fabricating passports, recruiting agents, and accumulating and passing along confidential and secret information.

Lee Pressman was a labor attorney and earlier a US government functionary, publicly alleged in 1948 to have been a spy for Soviet intelligence during the mid-1930s, following his recent departure from Congress of Industrial Organizations (CIO) as a result of its purge of Communist Party members and fellow travelers. From 1936 to 1948, he represented the CIO and member unions in landmark collective bargaining deals with major corporations including General Motors and U.S. Steel. According to journalist Murray Kempton, anti-communists referred to him as "Comrade Big."