Three thousand Boeing Machinists in St. Louis, who build F-15 and F-18 fighter jets, struck last summer. Four thousand meatpacking workers in Greeley, Colorado, walked out in March on the industry’s first major strike in 40 years. And in 2023, nurses with the 80,000-member FIQ in Quebec struck after rejecting a contract offer. Hear how taking militant action has strengthened their unions.