Situationist refers to a member of the Situationist International (SI), a very small group of international political and artistic agitators with roots in Marxism, Lettrism and the early 20th century European artistic and political avant-gardes. Formed in 1957, the SI was active in Europe through the 1960s and aspired to major social and political transformations. In the 1960s it split into a number of different groups, including the Situationist Bauhaus, the Antinational and the Second Situationist International.