I love the Southern Poverty Law Center. The work they do is so vital. They publish Teaching Tolerance, to help us raise a generation of children who don't hate. But they also work to actively eliminate hate groups. They just won a big court case against the Klan in Kentucky.
They also keep a close watch on the status of hate groups in our country. This Hate Groups Map is astounding. There were over 888 active hate groups in the U.S. last year. Check out your state to see how many groups are at work where you live.