In the interwar period, a system for the movement of men, arms, and printed matter developed into a political network that in imperial sources came to be called the “lascar system.” Lascars were Indian seamen who worked for British and international merchant shipping companies and had contacts with trade unionists, communists, anarchists, and other politically active parties across the world—in particular in port towns such as Hamburg, Antwerp and Marseilles. They became key players in the politics of the interwar world, and especially in a still-colonised India, which was subject to various censorship regulations and a panoply of repressive legislation. A number of lascars became crucial in the emerging communist movement and in trade union politics. In a world of increasingly stringent border controls, restrictions on the movement of people, and paranoia about political radicalism and its ability to “infect” new areas, the lascars' mobility became an asset to political movements and a source of anxiety for states.

Given this, it is surprising that the literature on lascars seldom, if ever, addresses the question of their political activities. This essay takes some steps in that direction, focusing on the 1920s, when the “lascar system” took shape. “Lascar” is of course a name given to a profession, not an identity or a political ideology; and yet the importance of this profession in the politics of the early twentieth century, and of the interwar period in particular, is far too important to ignore or treat as mere coincidence.