There are a few types of biker gangs and not all of them are bad. Some biker gangs are formed by friends with a common love for motorcycles and going on bike trips. However, biker gangs gained a bad rep because of the notoriety caused by biker groups that became outlaws. They were labeled “one percent” MCs (motorcycle clubs) that since the 1930s, have been hounded by the federal government. They are into various types of crime, including contract killing, racketeering and drug trafficking. These 10 most dangerous biker gangs in the U.S are still around and continue to be a scourge to law enforcement agencies.