John Grierson is considered the creator of the documentary genre. He originally made poetic documentaries but later felt they were better suited as educational resources rather than entertainment. During World War 2, propaganda documentaries were used widely by the Nazis and others to influence public opinion. In the 1950s, the cinema verite style emerged which aimed to capture real, unstaged events. In the 1960s-1970s, politicians began using documentaries as a political tool to support or oppose agendas.