What careers are relatively easy to get into with decent unions behind them?

Don't think its "technically" considered professional advice (since I'm just looking for general info), but not sure where else to turn. I have been apart of the corporate world for a while, and even though I follow all the rules, my companies consistently find ways/loopholes to screw me over.

Are there any industries or careers that are kind of easy to get into with strong union protections?

When I say "easy" I understand there will be education involved, but I already have a degree and am scared to waste more money and time (for seemingly nothing) again.

I have no desire to get rich or anything, I'm just hoping to get ideas on what I can pivot my career to so I can support myself and my loved ones without worry of the rug being pulled out from under me again.