SAN FRANCISCO – May Day protests may disrupt the morning commute in major U.S. cities today as labor, immigration and Occupy activists rally support on the international workers’ holiday.

Demonstrations, strikes and acts of civil disobedience are being planned around the country, including the most visible organizing effort by anti-Wall Street groups since Occupy encampments came down in the fall.

While protesters are backing away from a call to block San Francisco’s Golden Gate Bridge, bridge district ferry workers said they’ll strike this morning to shut down ferry service, which brings commuters from Marin County to the city. Ferry workers have been in contract negotiations for a year and have been working without a contract since July 2011 in a dispute over health care coverage, the Inlandboatmen’s Union said.

A coalition of bridge and bus workers said they will honor the picket line, which may target an area near the bridge’s toll plaza. Occupy activists from San Francisco and Oakland are expected to join the rally.

Across the bay in Oakland, officers are preparing for a long day as hundreds of “General Strike” signs have sprouted across town.