Thousands of city workers in Los Angeles abandoned their jobs Tuesday in a one-day strike, calling attention to their claims of unfair labor practices and what they say is the city’s unwillingness to bargain in good faith.

The strike is the first work stoppage for employees in America’s second-largest city in more than 40 years. About 11,000 city workers for SEIU Local 721, including sanitation workers, heavy-duty mechanics and engineers at the Los Angeles International Airport, custodians at public schools and lifeguards are staged the walkout and took to picket lines early Tuesday.

The disruptions led to trash-pickup and non-emergency 311 call center delays as well as some animal shelters and swimming pool closings. Police and fire service were not expected to be impacted, nor were flights at the airport where some protesting occurred, but travelers were encouraged to arrive earlier than usual for departing flights.

Los Angeles has seen its share of labor stoppages this year. Writers in Hollywood have been striking since May with actors joining them last month. Union workers at 46 L.A. area hotels have had staggered stoppages this summer and Los Angeles Unified School District education workers held a contentious three-day strike in March.

“We’re proud to join writers, actors, and our countless other Union siblings striking for respect in Los Angeles,” SEIU Local 721 posted on X, the social media site formerly known as Twitter.

L.A. Mayor Karen Bass said Monday in a thread on X that “The City of Los Angeles is not going to shut down,” due to Tuesday’s strike. But Bass acknowledged “parking enforcement, traffic operations, control for permitted special events and constituent calls for service to signals and sign repair will be impacted. Residents may experience traffic delays at major events held within the City of Los Angeles.”

Why are Los Angeles city workers going on strike?

Citing “repeated labor law violations,” the union, whose members protested at the airport and at City Hall, declared a strike on Aug. 4. The union voted to authorize a strike back in May if new contract negotiations stalled during the summer. The union believes the city has failed to bargain in good faith and engaged in practices restricting employee and union rights.