The other day I came across this quote from civil rights activist Bayard Rustin (probably most famously known as the organizer of the March on Washington where MLK delivered his "I Have a Dream" speech).
We need, in every community, a group of angelic troublemakers. Our power is in our ability to make things unworkable. The only weapon we have is our bodies. And we need to tuck them in places so wheels don't turn.