There was the Women's March, the Tax Day March, the March for Science and the Peoples Climate March. Next up, advocates for immigrant rights and organized labor will hit the streets of Los Angeles for a May Day rally.

Organizers of the Resist Los Angeles march believe the event could draw as many as 100,000 demonstrators to downtown L.A. on Monday, May 1st, also known as International Workers' Day.

Last year's May Day march, held on a Sunday, drew far fewer people — somewhere between 2,000 and 10,000.

The 2017 march will be the first time since 2006 that all the city's May Day marches end at the same spot.

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David Huerta, president of SEIU United Service Workers West, which represents janitors, security officers and other workers, tells KPCC, "We have a moment in time that we have to stand up and resist and respond to. We are a nation of immigrants. We are a nation of differences. In those differences, there's power. And right now, we need to come together and form that sense of unity in the resistance to the Trump agenda."

The protest, which was organized by a coalition of labor, immigrant-rights and faith-based groups, will start with a rally at 11 a.m. at MacArthur Park and end at City Hall.

Several local officials including mayor Eric Garcetti, state senator Kevin De Leon, and L.A. County supervisor Sheila Kuehl, are slated to speak at the event.

The march is expected to tie up traffic in downtown for several hours. Metro is adding trains to accommodate the expected influx of riders and police will be on maximum deployment Monday.

Union members have traditionally marched on May 1 to show their support for workers' rights. KPCC's Leslie Berestein Rojas explains: "In the United States, the annual events have become a rallying point for immigrants and their supporters since massive demonstrations in 2006 against a proposed immigration enforcement bill."