1 April 1949: NYC Brewery strike
On this day, 1 April 1949, 6,000 workers in 11 breweries in New York City walked out on strike for a pay increase, better staffing and a 35 hour working week instead of 40. The strike lasted 2 1/2 months, and massively slashed beer production in New York, previously the capital of the production in the country, causing Wisconsin to overtake it. The drought of local brew meant that beers from the Midwestern United States managed to penetrate the market for the first time, with Blatz becoming briefly popular. They eventually won most of their demands, and a reduced working week of 37 1/2 hours.
More information, sources and map: https://stories.workingclasshistory.com/article/8037/new-york-brewery-strike