By Mark Potok

The infection is spreading. Like pus from a wound, hatred is seeping from the most virulent extremities of our society into the organs of American democracy. The body politic is at risk of falling ill.

For at least the sixth year in a row, the number of hate groups documented by the Intelligence Project has risen. There are now 844 of these groups operating in America. That's up 40% from 2000.

What's fueling the haters? Immigration mostly, as racist extremists organize in opposition to what foreigners are increasingly bringing to our shores — more human diversity and multiculturalism.

Read the complete article from Southern Poverty Law Center