The expression ‘Foucault’s Marxism’ is not new. Antonio Negri used it recently in a precise sense, which I will later analyse. Other authors have explicitly recognised Foucauldian Marxism, defining it as ‘a materialism of the human body’0F1 or associating it with Althusserianism.1F2 I have previously spoken of ‘Foucault’s unavowed Marxism’, showing that Foucauldian research adopts Marxist methodological principles and develops in a space previously defined by Marxism.2F3 In the same sense, Jacques Bidet, to whom I will also return later, has seen in Foucault a prolongation of Marx.3F4 Although Bidet insisted on differentiating between Marx and Foucault, he couched the difference in terms of a collaboration framed in the Marxian perspective, which is consistent with the idea of a Marxist nucleus in Foucauldian thought.