The small ad below from the Canadian Jewish Review is a testament to the strength of unions in the city in Montreal as of 1960, as it shows a fairly long list of unionized bakeries here in Montreal and urges consumers to "always buy bread with the union label."
There were about 100 bakeries at the time, according to the Lovells 1958 listings, these 13 unionized bakeries were likely in the minority.
Arena Bakeries 84 Mont Royal W3545 Park Ave5630 Victoria Ave Bagel King Bakery 5167 DecarieBoyman's Bakery 4874 St. LawrenceCantor's 5563 Park 6579 CdN Community Co-operative Sydicate 1643 de Bullion Kosher Quality Bakery 4082 St. L Levin Brothers 5143 Decarie 3670 St L New St. L Bakers 3830 St LSchechtman and Son 201 St. Viateur W and Shawbridge Qc, VanHorne Bagel 4655 Van HorneVan Horne Bakery 1341 Van Horne
The local origins of the union-label bread appear to be from a bread breakers strike in 1942, although it could also be prior because the union label system had been season elsewhere as early as 1912.