This article was originally published at Labor Notes. The spirit of unionizing is in the air, from Amazon to Starbucks. Now the workers in two frozen food factories in California are getting in on the action. But they’re facing serious union-busting from their employer, Amy’s Kitchen, despite its progressive branding. Amy’s Kitchen is the sixth-largest maker of organic frozen meals in the United States and the top U.S. producer of organic vegetarian food, according to the North Bay Business Journal. The company employs more than 2,000 workers, a majority of them Central American immigrants who do not speak English. On…