This article makes theoretical and empirical contributions to the recent literature on the socialisation and punishment of state and non-state actors. First, it argues that the English School can add significantly to our understanding of the socialisation and punishment processes because of the theory's emphasis on great powers as ‘custodians’ of the society of states. Second, it analyses the policies of the United Kingdom, France, and, to a lesser degree, a number of other powers toward the Bolsheviks and the Whites during the Civil War and beyond (1917–1924). The basic argument is that London, Paris, and other capitals acted like ‘guardians’ of the society of states in their attempt to punish and socialise the participants in the Civil War.