Economist, Epistemologist … and Censor? On Otto Neurath’s Index Verborum Prohibitorum

This article is about Otto Neurath’s infamous proposal to combat metaphysics by creating and publishing an index of prohibited words. The logic of this proposal is explicated in the frameworks of Neurath’s philosophy of science and his International Encyclopedia of Unified Science. I reconstruct two arguments within Neurath’s project to defend the proposal against criticisms from Neurath’s colleagues and against the charge that philosophers ought not be censors.