Harold Daggett has been the main labor leader getting criticized recently for a large salary. He's the leader of the International Longshoremen's Association (ILA), and makes somewhere in the ballpark of ~$1M a year. The ILA is striking right now in the hopes of getting a ~70% wage increase over the next 6 years, better healthcare benefits, and better retirement contribution.
If I were a longshoremen making $130k, and I stood to get a ~70% wage increase + benefits, I'd absolutely be okay with the person who could make that happen making a low 7 figure salary.
Generally, I think the discussion around labor leader salaries to be very insidious. The truth is that they're fighting for chump change against an industry that's pulling in hundreds of billions in profit. And the same goes for the Teamsters. I'll let the respective unions determine leadership profits, but I'll 1000% support whatever they agree upon, so long as the union leaders are making sure that workers get treated well.