Amazon has subcontracted a lot of its deliveries to "separate" companies,
to thwart holding it accountable.
The workers at one of them now demand Amazon negotiate, but Amazon wants
to shut down that subcompany instead.
The easiest way to hold Amazon responsible. Don't buy from there, and
ask your friends not to buy anything for you from there. Inform web
sites that ask people to buy from Amazon through their pages that you
boycott Amazon and suggest they choose another way to raise funds.
I go even further than this. I refuse to identify myself when buying
products, aside from prescription medicines.