This was news to me. The Welch comments were pure theater. McCarthy revealed nothing that was not disclosed by Welch weeks earlier.
AIM Report: Looney Clooney Smears Senator McCarthy - January A
"..What Clooney's movie leaves out is that Welch himself had outed Fisher six weeks earlier.
Welch "had brought it up publicly in the New York Times," Evans tells AIM. "In the New York Times there was a big picture of Fred Fisher [with Welch saying] he had relieved him of the [Army/McCarthy] investigations because he [admitted] he had been a member of the National Lawyers Guild when Welch confronted him." Thus, says Evans, "Welch had done exactly what he was deploring McCarthy for doing.".."