[...] As Marx argues in Capital, the ‘worker emerges from the process of production looking different from when he entered it’. Starting as a seller of their own labour power, the workers come to the conclusion that they ‘have to put their head together . . . as a class’ so ‘they can be prevented from selling themselves and their families into slavery and death by voluntary contract with capital’. For Tronti this is ‘a political leap’, and ‘it is the leap that the passage through production provokes in what we can call the composition of the working class or even the composition of the class of workers’.