Fraternities and sororities are private social groups common to many colleges and universities in the U.S. They have a long history as part of the American higher education experience. Students pay membership fees. The groups hold parties and other social events. Some offer shared housing. Members usually also must take part in community service programs. And members often help each other find jobs after they graduate. But there is a darker side to Greek life, as involvement in fraternities and sororities is often called. The term comes from the letters of the ancient Greek alphabet the groups use to make their names. The process of becoming a member sometimes involves what is called hazing. This is when current members force pledges, those interested in joining, to take part in dangerous, abusive or possibly illegal activities.