[2] He was moved to New York City by the Communist Party the following year to work at national headquarters as a full-time youth section functionary.
[4] In that capacity he attended the 6th World Congress of the Young Communist International (YCI), which elected him to the Executive Committee and Secretariat of that body.
[2] Green proved himself loyal to the new leadership of the CPUSA over the next two years and was returned to New York City and a place on the party's National Board in 1947.
Along with 11 other top party officials, Green was indicted in July 1948 under the Smith Act and convicted and sentenced to a long term of imprisonment following a lengthy 1949 trial.
[4] Unlike his co-defendants Green became a fugitive from justice following the Supreme Court's decision to uphold the verdict in 1951, remaining in the underground until voluntarily surrendering to authorities on February 27, 1956,[4] Thereafter, Green was incarcerated in federal prison until July 29, 1961,[4] when he was released early due to good behavior, although barred from association with known communists until expiration of his full sentence under terms of his release.
[8] In 1991, following the collapse of communism in the Soviet Union, Green left the party and helped found the Committees of Correspondence for Democracy and Socialism.