May Day, falling two days after Donald Trump’s destructive first 100 days, makes for much symbolism in the struggle for justice and the soul of America. While Trump and his administration arbitrarily and ineptly attack immigrants from all over the world—especially Muslims—and the administration works to undermine labor rights across the board, hundreds of thousands of people will be pushing back, striking and protesting Monday in what is shaping up to be the biggest May Day demonstrations in at least 40 years.

The biggest and one of the most unified actions will be in Los Angles, a Democratic stronghold and sanctuary city with a vibrant labor movement and home to hundreds of thousands of immigrants, many of them undocumented.

Kent Wong, the director of the UCLA Labor Center and a vice president of the California Federation of Teachers, explains that this May Day “is being spearheaded by the Los Angeles County Federation of Labor, representing more than 800,000 union members. Some of the most dynamic labor organizing campaigns in Los Angeles have been led by immigrant workers, including janitors, hotel workers, home care workers, food workers, and car wash workers.”

The massive show of strength and solidarity by the labor movement in L.A. and elsewhere is a relatively new development. Wong explains: “Although May Day grew out of the struggle for the eight-hour day in Chicago in 1886, for generations the U.S. labor movement had refused to stand in solidarity with global worker celebrations on May Day. One of the largest May Day demonstrations in U.S. history occurred in 2006, in opposition to draconian anti-immigrant policies being proposed by U.S. Congress.”

Now according to Wong, 120 years after the first May Day in Chicago, “the spirit of May Day has returned to the U.S. led by a new generation of immigrant workers.“

There is large-scale mobilizing in Los Angeles for May Day, with labor unions joining workers’ centers, immigrant rights groups, faith-based networks, and community organizations. Wong says, “Many unions are encouraging their workers to engage in a one-day strike. The broad-based coalition has united with leaders of the women’s march, which mobilized the largest women’s demonstration in history the day after the inauguration. This growing labor and community alliance is also credited with the recent victory of the campaign for the $15 minimum wage in Los Angeles and California.”

On the national level, the hope of many is that May Day 2017 will build lasting alliances for immigrants’ rights, workers’ rights and social justice, to lead the resistance against Trump and to build a broad-based movement for change. Much of the energy for change is coming from the immigrant community.