In the 1950 Tydings Committee hearings, Budenz testified that Owen Lattimore, one of the so-called "China Hands," was a member of a Communist cell within the Institute of Pacific Relations but not a Soviet agent. The reliability of his testimony came under question because, in all of his 3,000 hours of debriefing before the FBI (1946–1949), Budenz had never mentioned Lattimore's name. In 1951, Budenz again testified against Lattimore, this time before the hearings of the Senate Internal Security Subcommittee, headed by Senator Pat McCarran. During this second testimony against Lattimore, Budenz claimed Lattimore was both Soviet agent and secret Communist.