William Henry Taylor
Elizabeth Bentley told the FBI in 1945 that several Treasury Department officials, Harry Dexter White, V. Frank Coe, and William H. Taylor passed along information to the Soviet intelligence from a cell headed by Nathan Gregory Silvermaster and William Ullman. To handle the volume of material passing through the group, Ullman, who lived in Silvermaster's house, had set up a darkroom in the basement to photograph the documents rather than copy them by hand.
On 19 October 1953 Taylor testified in a private session of the Senate Permanent Subcommittee on Investigations chaired by Sen. Joseph McCarthy regarding stolen occupation currency plates at the end of WWII. 
- McCarthy Hearings, Testimony of William Henry Taylor, Executive Session, Vol. 4: 3403 - 3418 (681 - 696 PDF), 19 October 1953.