SEIU-USWW, which says it represents tens of thousands of workers in California, was among many unions and organizations calling for people to participate in May Day; Huerta said what’s unique about May 1 is that it’s been driven by grassroots organizations.

A May Day rally and march is planned for Friday from MacArthur Park to Grand Park in downtown Los Angeles. The gathering is expected to begin at about 10 a.m. in the park, where speeches are planned head of the march to Grand Park.