Today on Post Reports, we follow two union fights at Amazon warehouses with very different outcomes, and what they can tell us about what it takes to go up against a trillion-dollar company.Read more:In early April, the labor movement saw a huge victory: Workers voted to unionize an Amazon warehouse on Staten Island. Our reporter Greg Jaffe went up to New York to meet Chris Smalls, the charismatic leader of a new kind of worker-led movement. Greg had one big question: Could this movement spread?There would be another test just a few weeks later, at a second Staten Island facility across the street. Despite high-profile support, the workers would learn that replicating a truly grass-roots organizing effort would be even more challenging than they thought.