Of course all political parties are disgusting in liberal democracies but there are some that just are insane.
In Mexico it has to be PAN, they’re your usual latin american conservative party. Elitists, very catholic, racists, malinchistas ( they hate mexico and its culture ). Right now they’re going insane because a former secretary of national security was declared guilty off collaborating with drug cartels in a US jury ( they idolize the US so this is funny af )
I’m reasonably convinced every Western communist party is infiltrated to a certain extent. It would explain the CPB/YCL’s lack of ‘vetting’, so to speak. One of their members I encountered didn’t even realise that the party called itself Marxist-Leninist!
I wouldn’t be surprised.
J Sakai’s short book on security talks to this. It’s well worth reading. He challenges the idea that security involves secrecy and tech issues. These are relevent. But the thing is to insist on free and open, critical discussion and to watch out for bad politics (sounds like you’ve found some, although I’d suspect that an actual agent will be briefed on the party’s core ideology). There’s a copy on archive.org.