What "others"? All you've got is the Schwarz article. Stephen Schwarz (whoever that is) can certainly admit to being a former Trotskyist, but he can't "admit to" this being an alleged property of other people, any more than I can "admit" that you are a murderer. He has to PROVE it, which he has not.
Which reminds me, what is the "INFLUENCE"? (Fill in the blanks in #86.)