Kaghan was turned down for a job promotion as a security risk before he even testified before McCarthy's committee. Kaghan roomed with a Communist Party member for a year, attended a dozen or so communist party meetings (he could not remember who else was there or what was said), supported the Abraham Lincoln Brigade (but couldn't remember if he joined it), wrote plays for a theater group funded by the Soviet Union (plays which followed the CPUSA line) and signed a nominating petition to put a Communist Party member on the ballot in NYC. When the Committee sent investigators to Europe to check up on his operations, he sicced VOA employees on them to shadow their every move.
Kaghan's executive session testimony, which was sealed until last May, is here
Roy Cohen, who shared the same last name, was not pleased Kaghan had changed his to Kaghan (more than a few who testified before the committee and many who took the Fifth, operated under fake names).