Neo-Marxism is a Marxist school of thought encompassing 20th-century approaches that amend or extend Marxism and Marxist theory, typically by incorporating elements from other intellectual traditions such as critical theory, psychoanalysis, or existentialism (in the case of Jean-Paul Sartre). As with many uses of the prefix neo-, some theorists and groups who are designated as neo-Marxists have attempted to supplement the perceived deficiencies of orthodox Marxism or dialectical materialism. Many prominent neo-Marxists, such as Herbert Marcuse and other members of the Frankfurt School, have historically been sociologists and psychologists. Neo-Marxism comes under the broader framework of the New Left. In a sociological sense, neo-Marxism adds Max Weber's broader understanding of social inequality, such as status and power, to Marxist philosophy. Examples of neo-Marxism include critical theory, analytical Marxism, and French structural Marxism. Erik Olin Wright's theory of contradictory class locations is an example of the syncretism found in neo-Marxist thought, as it incorporates Weberian sociology, critical criminology, and anarchism.