[alphonsegaston]

Marxists.org has an archive of many of their writings:

https://www.marxists.org/subject/frankfurt-school/

And Horkheimer is of course famous for saying, "If you don't want to talk about capitalism then you had better keep quiet about fascism."

[Touche]

That's irrelevant to whether they self-identified as Communists. The link you gave indicates that they didn't, quite the contrary.

[alphonsegaston]

Ah, apologies. I thought you were asking in good faith instead of trying to score some semantic point. In that case, you describe Marx as a "communist thinker", which would make the Frankfurt School(who were Marxists) communists by the terms of your categorization.

[Touche]

Why did you think this was a good-faith conversation when your assumption is that I was saying any Marxist sympathetic person is evil?