The riots that broke out in various British port cities in 1919 were a dramatic manifestation of a wave of global unrest that affected Britain, parts of its empire, continental Europe and North America during and in the wake of the First World War. During the riots, crowds of white working-class people targeted black workers, their families and black-owned businesses and property. One of the chief sources of violent confrontation in the run-down port areas was the 'colour' bar implemented by the sailors' trades unions campaigning to keep black, Arab and Asian sailors off British ships in a...