Al Rojas helped found the United Farm Workers Union in California more than 50 years ago, and lives in Sacramento.
He says this year's rally will be different than in past years because there is widespread support for the undocumented community.
Rojas says the march includes a focus on that workforce, and many others.
"We're all workers and the workers today in this country are being hit hard with this whole question of corporate greed," Rojas says. "It's all about money."
Rojas says he expects to see broad support, with many religions, races, community groups and unions represented.
The International Workers' Day march starts at Sacramento's South Side Park and ends with a rally at the West Steps of the Capitol.
Hear the full interview with Rojas in this Insight segment.
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