Actually poor ol Josh White also had his troubles with the Commitee. Before going to testify he apparently told Pete Seeger, "that he was going to be a "heel" the next day."He was pretty much "persona non grata" with Sing Out til the end of his life. Nobody ever said he couldn't pick that guitar though.
It may be useful to note that both Josh and Burl had decidedly "crossed over" into mainstream entertainment and audiences by then.........but so had Pete....and he stood up to 'em.
Rick