The older DNC too. Maybe even going back to 1832.
Umm ... HUAC was convened by Democrats. They were so-called “progressives” (which was bad enough) but they weren’t yet anti-American socialists.
Before the reagan Democrats there were what we might call the McGovern Republicans, people like Hillary, who were the unwholesome part of the Republican party that swept into the Democrat party to join with the equally vile resident far Left Democrats. They took over the party apparatus. Carter was actually the last real push back agains them to try to dislodge them ... which failed.
Now nothing of the old extreme Left is extreme to them anymore. They probably think McGovern was centerist and LBJ right of center.