William Ward Pigman (March 5, 1910 – September 30, 1977) was a chairman of the Department of Biochemistry at New York Medical College, and a suspected Soviet Union spy as part of the "Karl group" for Soviet Military Intelligence (GRU).
He worked for the National Bureau of Standards and the Labor and Public Welfare Committee.
[2] He supplied documents to Whittaker Chambers and J. Peters for Soviet intelligence as early as 1936.
[1] In his book, Witness, Whittaker Chambers refers to Pigman using the pseudonym "Abel Gross".
[4] He died on September 30, 1977, in Woods Hole, Massachusetts from a heart attack.