Between 1933 and 1945,  Germany established about 20,000 camps to imprison its many millions of victims. These camps were used for a range of purposes including forced-labor camps, transit camps which served as temporary way stations, and extermination camps built primarily or exclusively for mass murder. From its rise to power in 1933, the  regime built a series of detention facilities to imprison and eliminate so-called "enemies of the state." Most prisoners in the early concentration camps were German Communists, Socialists, Social Democrats, Roma (Gypsies), Jehovah's Witnesses, homosexuals, and persons accused of "asocial" or socially deviant behaviour. These facilities were called "concentration camps" because those imprisoned there were physically "concentrated" in one location*.