Instead of imply, I'll just state that they supported movements to further their own interests, which were not identical with the interest of the followers of those movements.
I don't disagree that leaders like Ralph Nader or Martin Luther King advocated for what they thought was a good idea, which might not have a close relationship with what the followers would necessarily articulate as goals.
What specific changes in positions advocated occurred based on this disconnect? I'm particularly interested in changes that occurred because the leaders were Communist sympathizers when the membership wasn't.
I have found this most wonderful (if fairly lengthy) article, and thought you would enjoy having it brought to your attention.
It is so good, I think we should include it among the references in the "Politics is the Mind Killer" wiki page. But, before that, I submit it to you, and ask you: is there anything in this article that would warrant its exclusion from this site? I mean, besides the fact that it is about politics, and written by a notorious Social-democrat (And is that in itself grounds for exclusion?).