The National Labor Relations Act gives you the right to bargain collectively with your employer through a representative that you and your coworkers choose. What does that mean?
Your union and employer must bargain in good faith about wages, hours, and other terms and conditions of employment until they agree on a labor contract or reach a stand-off or “impasse.” If negotiations reach an impasse, an employer can impose terms and conditions so long as it offered them to the union before impasse was reached. Once a contract is in place, neither party may deviate from its terms without the other party’s consent, absent extraordinary circumstances. If a contract expires before the next contract is in place, almost all the terms of the expired contract continue while the parties bargain (the exceptions being union security, management rights, no-strike/no-lockout, and arbitration provisions).