True in any profession.
I’d tend to disagree especially due to my own professional experience. I’ve had the luck to be allowed freedom of thought and expression in several job situations. My most immediate example is a College institution when a political point was made, I heartily disagreed very openly with my immediate head. I was rewarded when all was said and done, not punished because I refused to toe the correct political line.
And yes, this was a liberal institution, so I was happily surprised.