It consists of 310,000 workers,and associate members in industries including manufacturing, media, aviation, forestry and fishing,[1] making it the largest private sector union in Canada.

[4] On January 16, 2018, the National Executive Board of Unifor decided unanimously to discontinue affiliation with the Canadian Labour Congress (CLC) and become independent.

In a notice posted on their website, they stated their reasons for the split were due to CLC and its affiliates lack of action and will in addressing alleged aggressive and undemocratic tactics of US-based unions towards Canadian locals.

[7] Unifor appeared on the Canadian broadcast of Super Bowl LIII in February 2019 to air an advertisement opposing General Motors' decision to shut the Oshawa Car Assembly factory.

On September 30, 2019, approximately 5,000 Unifor members from all of the above locals began a work-to-rule campaign after failing to negotiate new contracts with the provincial government.