I think it's virtually certain he was in a long term relationship with Aleksandrov. They lived together for years. One of my professors interviewed some old soviet mathematicians and they were like, yeah everyone knew.
It's not totally clear the Luzin testimony was gotten via blackmail though.
I looked it up and there doesn't seem to be conclusive evidence this happened.
I think it's virtually certain he was in a long term relationship with Aleksandrov. They lived together for years. One of my professors interviewed some old soviet mathematicians and they were like, yeah everyone knew.
It's not totally clear the Luzin testimony was gotten via blackmail though.
Yeah, the gay part is pretty well known from what I understood, the blackmail thing is what I didn't find much evidence for.