Nope, never a member of anything of that sort, though back in my college days I was tangentially involved in some groups that were occasionally targets of infiltration/co-optation by communist front groups, so I’ve seen how they operate, and am well aware that most of the people who are active in the groups they infiltrate don’t regard themselves as communists or support the objectives of overtly communist groups.
The communist groups, sometimes operating under their real name, and sometimes through front groups, do a lot of scouting of various types of groups that attract idealistic young adults and/or aging hippie types. They’re looking to recruit a few people who have more radical leanings, but their bigger mission seems to be to blunt opposition to specific political concepts and initiatives, by presenting them as consistent with the prevailing beliefs and objectives of other types of groups (peace groups, women’s rights groups, gay groups, environmentalist groups, pro-union groups, etc).
Sometimes they’re very shrewd operatives. Other times, not so much. I recall one occasion where a group of overzealous operatives, thinking they were gaining the respect of the group whose meeting they’d shown up to and been pitching comments into, got a little overconfident and one of them piped up to sing the praises of Castro’s Cuba. This didn’t go over well with the rest of the assembled group who, while mostly left-leaning, weren’t complete idiots. Despite the operatives continuing to raise their hands over and over to speak, none of them were recognized by the “facilitator” again, and they were drowned out by a chorus of “Oh, shut up!” when they tried to speak anyway.
The Revolutionary Communist Party didn't "infiltrate" these groups, they formed them!
Look up the term "Useful Idiot". Never mind, I did it for you: http://www.jewishworldreview.com/cols/sowell090100.asp