In the 1950s and 1960s, Sartre became involved in politics. Sartre said that France should leave Algeria, a country where France had many soldiers. In the 1960s, Sartre said that the Vietnam War was bad. In 1960, he wrote the "Critique de la raison dialectique" (Critique of Dialectical Reason). In the 1960s, Sartre had many arguments with Louis Althusser, a man who also believed in communism.