A black bloc is a protest tactic where the point is to cause destruction and chaos to the system with organized violence. It was named in Germany where Anarchists developed the tactic. The protesters wear black clothing and mask their faces to make it harder for police to pick out individuals.
This weekend in New York where the Occupy movement began the tactic was employed for the first time. New York Times reported a long-time Occupy organizer was one of those arrested for attacking a NYPD officer with a metal pipe. 41-year-old Alexander Penley, is an attorney and has been an Occupy Wall Street organizer since the movement began in the fall. The group tried to use eight-foot-long galvanized metal pipes to smash windows.