The way that the CIA has created and trained terrorist around the world, the FBI uses the same tactics state side. It usually starts with a simple game of divide and conquer. The people don't even need to dislike each other, all you have to do is convince them they do. You start the illusion with those easiest to convince and eventually they will climb into the boxcars themselves.

Who makes for the easiest to manipulate in any society?

HINT: Think logically.