The CUPW's first major
strike was an illegal
wildcat strike in 1965 (before public sector workers had the right to strike or even form unions) and is the largest illegal strike involving government employees. The action succeeded in winning the right to
collective bargaining for all public sector employees. Other major industrial actions included a strike in 1968 and a campaign of walkouts in 1970 that resulted in above average wage increases. Further strikes in 1974 and 1975 succeeded in gaining job security in the face of new technology at the post office. A 1978 strike resulted in CUPW president
Jean-Claude Parrot being jailed when the union defied back-to-work legislation passed by the
Canadian parliament. CUPW's defiance of the law caused a temporary rift between it and the more conservative
Canadian Labour Congress. In 1981, after another strike, CUPW became the first federal civil service union in Canada to win the right to
maternity leave for its members.
Canada Post's transition into a crown corporation In 1981, Canada Post was transformed from a government department to a
crown corporation, fulfilling a long-standing demand by the union. It was hoped that by becoming a crown corporation governed by the
Canada Labour Code, relations between Canada Post and its union would improve. While strike action has been less frequent, there were rotating strikes in 1987 and 1991 against plans to privatize postal outlets, both of which were ended by back-to-work legislation and also saw attempts by Canada Post to break the strike using
strikebreakers.
Organizing of RSMC In 2003, CUPW successfully completed the organizing of approximately 6,000 Rural and Suburban Mail Carriers (RSMC) into the Union and won a first collective agreement for these workers. This collective agreement is separate from the CUPW collective bargaining agreement. The two collective agreements have major differences. These differences stem from the RSMCs formerly being contractors as opposed to employees of Canada Post. For instance, RSMCs are paid in a contract style system as opposed to hourly, RSMCs are typically expected to find their own replacements during absences, and RSMCs may hire assistants who are not employed by Canada Post. Also in 2003 saw the first of many rollbacks for the Urban Postal Unit when the contract that was reached included the elimination of severance pay. Members ratified the Urban Mail Operations agreement by a vote of 65.4 per cent.
2011 rotating strikes On June 3, 2011, CUPW began labour actions against Canada Post with a series of rotating strikes. On June 14, 2011, at 11:59 p.m. EST, Canada Post announced a lockout of CUPW members. The lockout ended June 27, 2011, after Parliament passed a law rendering illegal any further work stoppage. CUPW's collective agreement was signed in 2012 and expired January 31, 2016. The RSMC collective bargaining agreement expired in December 2015.
2018 rotating strikes An agreement between Canada Post Corporation and the Canadian Union of Postal Workers, Urban Postal Operations, expired January 31, 2018. Failing to reach a new agreement, the union initiated a
series of rotating strikes across the country on October 22, 2018. In November, the Liberal government then passed Bill C-89, which mandated postal workers to return to work. CUPW workers then worked without a contract for the next two years, with the CUPW and Canada Post reaching collective agreements in September 2021, which expired in January 2022, and was renewed for a year, with the RSMC collective agreements expiring on December 31, 2023, and the Urban agreement expiring on January 31, 2024, after bargaining started on November 25, 2023.
2024 strike As of August 29, 2024, the CUPW and Canada Post have yet to agree on any collective agreements. On August 28, 2024, CUPW have posted on their website that their National Executive Board have scheduled strike votes meetings from September 9, 2024, to October 20, 2024. On October 28, 2024, it was announced that both bargaining units voted in favour of strike action (95.8% of Urban workers and 95.5% of RSMC workers voted yes). On November 12, 2024, it was announced that the CUPW had issued 72-Hour strike notices, and that Canada Post had retaliated with 72-Hour lockout notices. On November 15, 2024, a
nationwide strike for both bargaining units had taken effect at 12:01 am
Eastern Time. Following a request by
Labour Minister Steven MacKinnon on December 12, 2024, the
Canada Industrial Relations Board ordered strikers to return to work by the morning of the 17th, ending the strike.
2025 labour struggles and strike On the afternoon of May 19, 2025, the National Executive Board issued a 72 hour strike notice to the Canada Post Corporation. On May 22, 2025, the CUPW posted on their website that the National Executive Board officially took strike action by calling an
overtime ban for all union members. On Thursday, September 25, 2025, CUPW began a nationwide strike, citing government-proposed service cuts, including the end of home delivery to 4 million addresses, as the reason. ==Other postal unions==