 One continuing aspect of Hook’s involvement in Marxism was the completion in 1935 of his most significant scholarly contribution to the development of Marxist thought: From Hegel to Marx. This research had been undertaken during his residence in Europe, primarily in Germany and briefly in Moscow, after the completion of his doctoral dissertation at Columbia. In Moscow, Hook had carried out research at the Marx-Engels Institute in 1929, which was then headed by a scholar of the history of Marxism, David Riazanov. A tension between two opposing attitudes was paradigmatic of Hook’s involvement in Marxism during that period. On the one hand, Hook was immersing himself in what were considered canonic texts of Leninism; on the other hand, Hook was to discover himself reacting with abhorrence to the purge of Riazanov from the Institute, in part, presumably, on account of his objectivity in his approach to the sacred texts of the new State.