Foster probably gained his greatest local notoriety in Vancouver when he was appointed chief constable of the Vancouver Police Department on 3 January 1935. He came in during a shake-up and purge of the police to prepare the civic government forces for a showdown with the local communist movement. The
Communist Party of Canada's trade union umbrella, the
Workers' Unity League, was planning a
general strike for May 1935, and the local big business interests claimed that it was to be the beginning of a
Bolshevik revolution in Canada. The general strike and revolution never happened, but the city was flooded in the spring of 1935 with striking relief camp workers, which metamorphosed into the
On-to-Ottawa Trek that left Vancouver atop boxcars in early June. Foster restructured the police department significantly, and led an effort to eradicate crime and vice from the city. He initiated the first training of Vancouver police officers, updated police uniforms, added tear gas to the police arsenal, and established a "Communist Activities Branch" to gather intelligence. On one occasion, he used his influence to have a bylaw passed banning white women from working in Chinatown restaurants on the assumption that they were being lured into prostitution, or "white slavery" as it was known at the time, with Chinese clients. The move sparked a backlash from Chinese businessmen and from women who had lost their jobs from restaurants, which had their business licences revoked. Business licences were restored only when the owners agreed not longer employ white women any longer, and at least thirty women were forced to seek other employment. ==Battle of Ballantyne Pier==