It has nothing to do with bigotry what so ever. They are very much an anti-capitalist group or at the least have been hijacked by such. Whether they started out as such may be another argument....http://www.cpusa.org/article/blacklivesmatter/

They attended a Communist/socialist meeting in Chicago a few Months ago:

http://www.thepeoplessummit.org/2016/06/24/2467/