You don't seem to understand how propaganda works. You see, you can totally convince a lot of people to do your dirty work with the right words in the right places, especially if they already agree with you.
So you don't have to pay them anything at all. You just have to TELL them what they want to hear.
Why do you people always say that when many people picket something, they must have been paid?! No, they weren't paid, but their leaders, their organizers, and the people running coms sure as hell were.