OAKLAND, Calif. — Hundreds of Wall Street protesters blocked gates at some of the West Coast’s busiest ports today, delaying truck traffic in a day of demonstrations that organizers hope will cut into the profits of the corporations that run the docks.

Protesters picketing at ports in California and as far away as Vancouver, British Columbia, caused longer wait times for trucks. Authorities said, however, there were limited disruptions and no major clashes with police.

The movement, which sprang up this fall against what it sees as corporate greed and economic inequality, is targeting “Wall Street on the waterfront” in its most dramatic gesture since police raids sent most remaining Occupy tent camps scattering last month.

Similar blockades were also under way at ports elsewhere, including in Oregon.

It was unclear whether demonstrators could amass in sufficient numbers to significantly disrupt or force port closures as they did last month during an overnight shift at the Port of Oakland. The union that represents longshoremen says it doesn’t support the shutdowns.

Protesters are most upset by two West Coast companies: port operator SSA Marine and grain exporter EGT. The bank, Goldman Sachs, owns a major stake in SSA Marine and has been a frequent target of protesters.

They say they are standing up for workers against the port companies, which have had high-profile clashes with union workers lately. Longshoremen at the Port of Longview in Washington, for example, have had a longstanding dispute with EGT.

In Oakland, officials urged protesters to consider the impact on workers. Port workers and truck drivers say the protests will hurt them.

Several hundred people picketed at the port before dawn and blocked some trucks from going through at least two entrances. A long line of big rigs sat outside one of the entrances, unable to drive into the port.

“This is joke. What are they protesting?” said Christian Vega, 32, who sat in his truck carrying a load of recycled paper from Pittsburgh this morning. He said the delay was costing him $600.

“It only hurts me and the other drivers. We have jobs and families to support and feed. Most of them don’t,” Vega said.

Police in riot gear monitored the scene as protesters marched in an oval and carried signs with messages such as “Shutdown Wall St. on the Waterfront.” No major clashes were reported.

Port spokesman Robert Bernardo reported some disruptions to truck traffic but that maritime operations continue there. The port has appealed to city residents not to join the blockade, which they said could hurt the port’s standing among customers and cost local jobs.

Organized labor appears divided over the port shutdown effort.

The Nov. 2 strike that culminated in the port’s closure had strong union support. This time, the city’s teachers union is backing today’s action while construction workers opposed to the closure say the port has provided jobs to many unemployed workers and apprentices.

In rainy Southern California, about 200 protesters held a four-hour demonstration at the Port of Long Beach, delaying some truck traffic at one of the world’s largest port complexes. There was one arrest.

In Portland, Ore., a couple of hundred protesters blocked entrances to two terminals at the port, preventing trucks from entering. Police in riot gear were on hand, but there were no immediate confrontations or arrests.

Workers at the two terminals were told to stay home, the Oregonian reported (http://bit.ly/unRr6l ). Spokesman Josh Thomas said an unspecified number of workers at the terminals wouldn’t be paid.

Before the protest began, police made three arrests and seized a gun and a sword from people who said they were on the way to protests. A spokeswoman for Occupy Portland said the armed men are not associated with the group.

“We do not send out folks with guns,” Kari Koch said. “We don’t plan anything illegal.”

In Vancouver, demonstrators briefly blocked two gates at Port Metro Vancouver. The Canadian Press reported demonstrators held up a large banner proclaiming solidarity with longshoremen involved in the Port of Longview dispute.

The disruption lasted an hour before the protest moved to a second gate, blocking it for less than 30 minutes before moving on.

Organizers of the port demonstrations said they hope to draw thousands to stand in solidarity with longshoremen and port truckers they said are being exploited. The International Longshore and Warehouse Union, however, distanced itself from the shutdown effort.

The union’s president suggested in a letter to members that protesters were attempting to co-opt the union’s cause to advance their own.

Shutdown supporters said they’re not asking longshoremen to organize a work stoppage in violation of their contract. They said they are simply asking them to exercise their free speech rights and stay off the job, in keeping with the union’s historic tradition of activism.

If protesters muster large enough numbers to block entrances, arbitrators could declare unsafe working conditions. That would allow port workers to stay home.

Officials at West Coast ports said they have been coordinating with law enforcement agencies as they prepare for possible disruptions. Protesters said police crackdowns in any city will trigger an extension of blockades in other cities as a show of resolve.

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