Amazon is a (probably illegal) monopoly that created and compounded its extra leveraged position against competitors due to deceptive listings, fake goods, and crappy Chinese goods sold to consumers, on top of its normal operation. However, that does not make unions good overall. For one thing in a competitive free capitalist market those people could get better jobs if they are so great. (i.e., Socialism is bad; if Amazon did something wrong sue them or let the government regulators do so) Also, a large number of the most popular unions have a long history of gross corruption (which is why the current admin works for them); and specifically, Staten Island where the AMZ workers have created their first union is a well-known mafia stronghold.
If you pay attention you can clearly see that Biden is in the back pocket of big labor (unions). All his extreme spending and speeches, and everything about covid was to serve those masters; which is now why inflation is so extreme and the rest of the economy is in shambles and getting worse. The unions with DC representation have a very extensive history of corruption, which is why Biden and his crew (including Hillary Clinton) have always been so close to them. You lose when they win.