I think Amazon fulfillment centers are a special case. Most people working there either move packages around or drive a truck. At least that is my understanding, somebody with better/first hand knowledge would be welcome to share.

Normally having a huge employer would be a boon to the city, but most of these people are going to be working for close to minimum wage and Amazon most likely negotiated with the city so they don't have to pay a dime.

Amazon pays significantly over minimum wage in Alabama, since they don't have one and use the federal $7. This is Amazon's advantage over smaller companies - they're more efficient and so they can afford to pay more.

There will never be international cooperation on labor laws. Countries have too much to gain from allowing companies to open sweatshops.