Starbucks implemented a more strict employee dress code this week resulting in protests and walk outs at some stores.

Starbucks and the union had temporarily agreed to collective bargaining over dress code changes as part of ongoing negotiations for a new contract. In December, a bargaining session with the company failed to produce better wage gains.

More than 1,200 Starbucks employees with Starbucks Workers United have gone on strike to protest a dress code policy that went into effect this week