 In trying to organise and understand Marx’s various criticisms of utopianism, it is helpful to distinguish between foundational and non-foundational variants. (This distinction is intended to be exhaustive, in that all of his criticisms of utopianism will fall into one of these two categories.) Non-foundational criticisms of utopian socialism are those which, if sound, would provide us with a reason to reject views which might be held by, or even be characteristic of, utopian socialists, but which are not constitutive of their utopianism. That is, they would give us a reason to abandon the relevant beliefs, or to criticise those (including utopians) who held them, but they would not give us cause to reject utopianism as such. In contrast, foundational criticisms of utopian socialism are those which, if sound, would provide us with a reason to reject utopianism as such; that is, a reason to refrain from engaging in socialist design, a reason not to describe in relevant detail the socialist society of the future. (Of course, that reason might not be decisive, all things considered, but it would still count against utopianism per se.)