Before the above time, this kind of thing went on sub rosa; except for the '50s and the HUAC and Senate Commie hearings. Oh, and the Rosenberg trials also brought out the stinking Commie protestors in full throat as well.
Before that time, in the late 1920s, the Sacco and Vanzetti trial brought out the stupid lefty celebs and bleeding hearted MSMers.
The BIG difference between the '20s and '50s, is that the vast majority of this nation's populace were anti-Commies and on the side of Law & Order! By the end of the 1960s, the stupid parents of the Baby Boomers, who followed the pied pipers of the faaaaaaaaaaaaaar left, just turned a blind eye/ignored it, or thought that it was "cool".
Re parents of baby boomers......
Or, they were just too comfortable, in their daily suburban lives, to bother to stand up against such nonsense.
Kind of like where we are, today. :(
Who ever organizes against, or shouts down these Antifa idiots? Anyone?