I did not know that applicants for U. California Berkeley faculty positions had to pass a 5-point test for commitment to Leftist ideals. Many other universities have similar requirements. Math professor Abigail Thompson
explains in the WSJ.
In the 1950s, the university had a requirement that faculty could not belong to the Communist Party, or any other organization with a mission to violently overthrow the American government. The Commies really were evil back then.
If you believe in free speech, the current system in 1000x worse.
The Math community is sharply split on this issue, as you can see from these published letters.
For a long time, I have heard excuses that academia is overwhelmingly Leftist because Leftists are smarter, or that university life appeals to socialists, or something. Now it turns out that they have a process for systematically excluding right-wingers!