Or, what is the difference between a union promise and a union guarantee?
People often vote to unionize on the belief that, somehow, the union will solve an issue that they have—whether it’s wages, benefits, or even unfair treatment.
By law, (under NLRB precedent cases) unions can promise to fix whatever it is that employees have trouble with.
However, the reality is, unions cannot guarantee one single improvement for employees.
All a union can do is ask. It is up to the employer to decide whether it will agree to the union’s requests.