I ended up in a managerial position at my company somewhat against my wishes due to various circumstances and I don't know how to reconcile this with my leftist beliefs. I do what I can to give my team raises whenever possible, and encourage everyone to take as much time off as possible, but I can't help but feel like a traitor to the cause. I have a mortgage and a kid on the way so leaving this job isn't really an option, but how else can I be a ally to the worker movement?
If that's true, it's a big problem. Since you're presumably making ok money, you need to adjust your finances and save up enough that quitting is an option. At that point, you will be less motivated by fear and can start saying 'no' to your own bosses more often. At that point you can serve as a good buffer for your team.