Arthur Herbert "Slim" Evans (April 24, 1890 – February 13, 1944) was a leader in the industrial labour union movement in Canada and the United States.

[3] On August 4, 1920, Arthur "Slim" Evans married Ethel Hawkins, who he had met while organizing miners in Drumheller, Alberta.

He led an IWW free speech rally in Minneapolis where he was arrested for participating and sentenced to three years in jail.

Two days after Evans arrived, strikebreakers hired by John D. Rockefeller, owner of the coal mines, attacked the striker's camp, killing 20 people including 12 children in the Ludlow Massacre.

Evans used UMWA funds for the strike, he was accused of embezzlement and sentenced to a three year prison term.

[8] The Worker's Unity League was the official trade union centre of the Communist Party of Canada.

Like the IWW and OBU which Evans had previously organized in, the Worker's Unity League was an industrial union.

British Columbia's attorney general dispatched a crops of 40 RCMP officers to monitor Evans and suppress the strike.

The Ku Klux Klan burned crosses, beat strikers, and sent threatening letters, in the name of anti-communism.

Evans immediately booked a train back to Princeton, where he led the strike to success, winning workers higher pay and improved workplace safety.

Relief camp workers struck on April 4, 1935, when they went to Vancouver, where they stayed and pressed their demands until the Trek began on June 3.

[17] The first batch of strikers left Vancouver, riding on boxcars, and were joined by many others in Kamloops, Field, Golden, Calgary and Moose Jaw.

The federal government had decided that the Trek would be forcibly stopped in Regina because of fears that it would gain momentum if allowed to reach Winnipeg that could turn it from a protest into a revolutionary movement.

An exhaustive government inquiry was held into causes of the riot, and its conclusions paved the way for reforming the relief camp system.

[23] He also led fundraising drives for the Mackenzie-Papineau Battalion, the volunteer contingent from Canada that fought the fascists during the Spanish Civil War.