Not only were not all of those Fifties' Communists bad guys, but not all of the Nineties' Patriots are good guys. That's the first thing to note. It should be expected, and contingency arrangements should already be in place. Far from seeking to limit its membership to the purportedly pure of heart, one of the patriots' principal attempts should be to recruit members. There are damned few perfectly pure people, and none of them reliable so.
Large membership is an aid to survival.
They must be honest. It's a placid enough world for the sheep who remain inside their assigned pasture. But on the other side of the fence there are wolves to be anticipated. And some of those wolves will be wearing sheeps' clothing.