The strike can be traced back to 1912 when the International Longshoremen's Association (ILA), began organizing the waterfront workers in Canada, alongside the Lumber Handlers' Union in Vancouver.
This intimidation of the strikers, coupled with the fact that ships were still being loaded and unloaded by numerous non-union workers, forced the strike to collapse two months later.
Following the pretext to the destruction of the ILA, the Shipping Federation provoked another major strike in the spring of 1935, locking out 50 dockers at the port at Powell River.
Dockers across the border in Seattle also refused to unload ships coming from Vancouver and Powell River that were manned by non-union workers.
On June 18, several weeks after the original lockout, between 900-1100 dockers and their supporters marched through Vancouver towards Ballantyne Pier where non-union workers were unloading ships.
The ILWU participated in numerous disputes in the following years, and in the 1940s, it was integral in winning many strikes that lead to better pay and conditions for waterfront workers.
Communist organizers with the Workers' Unity League (WUL) managed to seize control of the VDWWA's executive a decade later and transformed it into a militant union, which then began working towards strike action.
Especially targeted were those considered sympathetic to an independent union or simply disliked by the despatcher, making the allocation of work a punitive mechanism and the job itself insecure.
Historians agree that both strikes were driven by legitimate grievances: abysmal conditions in the relief camps and despatching and other workplace issues on the waterfront.
Militia units based in the Point Grey neighbourhood of Vancouver and in Victoria, British Columbia were also ready to be called to action on short notice.
On 3 June 1935, shortly after the waterfront strike began, the relief camp strikers left the city to begin the On-to-Ottawa Trek in an effort to take their grievance to the nation's capital.
On 18 June 1935, about 1000 protesters, consisting of striking longshoremen and their supporters, marched towards the Heatley Street entrance to Ballantyne Pier, where strikebreakers were unloading ships in the harbour.
Unlike earlier waterfront strikes, longshoremen were prevented from picketing the docks to discourage strikebreaking and claimed that they were going to go en masse to talk to the non-union workers.
They were led by Victoria Cross recipient Mickey O'Rourke and a contingent of World War I veterans and marched behind a Union Jack flag, to great symbolic effect.
Offices of communist organizers and the longshoremen's union were also raided, with tear gas shot through the windows to drive out any occupants before the police entered.
While far more localized than the On-to-Ottawa Trek, the Battle of Ballantyne Pier was part of the fierce, and perhaps paranoid, anticommunist reaction provoked by the Communists and the militant workers' movement they led.