mccarthy, exonerated by the venona papers if not before, was basically right about soviet agents working for the U.S. government. hiss turned out to be a Soviet spy (who consulted roosevelt at yalta).
the myth of who and what mccarthy is may never be corrected, but don't believe the narrative and legacy media positioning. a lie repeated often enough becomes the truth...even in your 9th grade history class. particularly after 50 years have gone by when nobody has been willing to confront the liars.
read "treason" by ann coulter for a better perspective.