Gatekeeping Communism?

I’ve seen a lot of posts on other platforms about “gatekeeping communism” in the US and not allowing more people to organize with them. I get being apprehensive about people you don’t know, since this country has a laundry list of federal sabotage in all anti capitalist/ anti racist/ anti-patriarchal movements, but is gatekeeping the only way to stay safe? I’ll say that that it’s already difficult to find people you align with as it is, and I know some people have had experiences with not even just the feds, but right wing nut jobs infiltrating unions to destroy them from the inside. I’m interested in hearing your in-depth perspectives and opinions on why or why not you think gatekeeping is the only way, and what alternatives if any you think there may be.