This has always been true and I can't understand how you would imagine it was ever otherwise.
What's interesting is how people's moral judgment of that correlates with their sympathy for the particularly unpopular opinion in question. Lots of people lost their jobs and careers for voicing opinions that were sympathetic to Communism, and we call that "McCarthyism" and "a witch hunt". This guy loses his job and many of us would cheer for it.
The situation we're discussing here is pretty different.
You're right--you don't know a lot about McCarthyism. The "Hollywood Ten" screenwriters who were blacklisted by the film industry (private employers making employment decisions!) were, in fact, members of the Communist Party USA, an organization that was directly controlled and financed by an adversarial world power. There was substance behind the spectacle.
As for people being accused of things without evidence--well, witness the people in this thread who keep repeating the lie that the author of the manifesto considers his women coworkers less capable than he is, the outright fantasizing in OP about the author getting punched in the face, etc. Looks pretty spectacular to me.
Yes, but 1) that was just the tip of the iceberg labelled "McCarthyism," and 2) even at the time, the issue wasn't that they had joined a political party, the issue was what that party proposed to achieve.
In the case of the Google's manifesto, I don't see anyone upset that the author holds an unpopular opinion or that he publicized his unpopular opinion; it's the content of the opinion itself that's at issue.
Both McCarthy himself and the Googler in question here tried to harm other people's careers by spreading untruths in a self-aggrandizing way. That seems like the most natural parallel to me.
It is only possible to justify identifying with this asshoel by completely ignoring the harm his "speech" does to his company's culture while vastly over-inflating the consequences he is likely to face. If he had said, "programmers should sit down, shut up, stop whining and write what they are told" no one here would have a lick of sympathy for him getting canned.
Perhaps you aren't employed in the United States: https://en.wikipedia.org/wiki/At-will_employment
If you are in fact aware of this concept, then I really don't understand your hyperbole.
It's a grey area though.
There are lots to say/critique on that manifest, but Yonatan's commentary piece is pure dishonest bile. Ironically it also strengthens the claim of an authoritarian regime at Google and its "our way or the highway" policy when facing discussions.
The piece is simply garbage. It was an ad hominem that attacks viewpoints the original author never presented, such as "... how women and men are intrinsically different and we should stop trying to make it possible for women to be engineers". Quite the opposite.