Personally, I wouldn't start worrying about "Liberal McCarthyism" in the United States until liberals have control of the presidency, the congress, and at least a fair majority of the states.
The fact that this post, and the Sam Altman posts, have been made invisible on this site is the millionth depressingly predictable example of why it's well past time for the people who are endlessly silenced to engineer their own solutions and not rely on the infrastructure of the current power-brokers.