The term "exploitation" is defined very loosely: it is more about the viewers' impression that this exploitation happens, than the people actually being exploited. The first exploitation movies appeared in the 1920s. Exploitation movies only became popular after the 1960s and 1970s, when there was less censorship. Very often, exploitation movies use recent news events to base their story on. Major film studios ofen avoid such events, because producing the movie takes a long time and a lot of money. 