[1] Stein joined the Communist Party some time in the late 1920s or early 1930s,[2] and co-organized the 1932 Chicago Counter-Olympics (also known as the International Workers Athletic Meet, the first Olympic counter-protest).
[2][1] In 1937, he helped organize a secret cell of the Party within a subcommittee of the Senate Committee on Interstate and Foreign Commerce, and later at the National Labor Relations Board.
[8] In December 1944, a House Miscellaneous report listed names and union affiliations of "110 leaders of the work in which the C.I.O Political Action Committee" engaged with the National Federal for Constitutional Liberties.
"[9] In December 1955, Herbert Fuchs testified under subpoena before House Committee on Un-American Activities (HUAC) and described Arthur Stein as a recurring leader in underground networks in the federal government.
[1] Their daughter Eleanor Raskin joined the Students for a Democratic Society and become a leader in the Weather Underground domestic terrorist group.