" Kelly Nantel, a spokesperson for Amazon, said that Amazon called the police on Smalls for trespassing, and not the other two workers. “Mr. Smalls — who is not employed by Amazon — has repeatedly trespassed despite multiple warnings,” she said. “Today, when police officers asked Mr. Smalls to leave, he instead chose to escalate the situation and the police made their own decision on how to respond.” "
This makes it sound like he was given a option to leave and didn't.
I think a union would be Amazon's worst nightmare.