Samuel Dickstein (February 5, 1885 – April 22, 1954) was a Democratic Congressional Representative from New York and a New York State Supreme Court Justice. He played a key role in establishing the committee that would become the House Committee on Un-American Activities, which he used to attack fascists, including Nazi sympathizers, and suspected communists. Authors Allen Weinstein and Alexander Vassiliev learned in 1999 that Soviet files indicate he was a paid agent of the NKVD.[1][2][3]
How many people are aware that the Hollywood Blacklist was originally a Jewish communist affair? You won't find this information in the relevant wikis.