Senior couriers

I am a "Senior Courier" and I want to join the Teamsters union and sign a card, but Management has told all of us Senior Couriers that we can't be part of the Union because we are considered management. Is this true?

That is false unless you have the power to hire and fire employees.

With a legal contract...

...Every aspect of your working life is covered, including safety, wages, benefits, pensions, seniority, schedules, dispute resolution, life insurance, clothing allowance and dozens of other issues. And before the company can change one thing, you have to agree to it.