He also worked as an attorney and organizer with the Transport Workers Union of America[2][3] See Smith Act trials of Communist Party leaders.
Sacher represented Irving Potash, Benjamin J. Davis Jr., and John Gates in a 1949 trial for charges of conspiring to overthrow the United States[4] Time wrote that Sacher "looked like a Dead End Kid" and "insinuated at one point that Judge Medina was prejudicing the trial".
He appealed Judge Medina's action, leading to a 5-3 decision by the Supreme Court to uphold the sanction.
[9] Sacher was one of several suspected Communists subpoenaed by the United States Senate Subcommittee on Internal Security.
[10] The Supreme Court held in a 6-2 per curiam opinion that Sacher's indictment for contempt of Congress did not meet the minimum pleading requirements under 2 U.S.C.