Dockworkers began picketing at the Port of Philadelphia early Tuesday after the International Longshoremen's Association announced the union would go on strike​.

Union dockworkers at ports across the U.S. began walking picket lines early Tuesday, snarling the movement of billions of dollars' worth of goods.

By Doyinsola Oladipo and David Shepardson NEW YORK (Reuters) -Dockworkers on the U.S. East Coast and Gulf Coast began a strike early on Tuesday, their first large-scale stoppage in nearly 50 years, halting the flow of about half the nation's ocean shipping after negotiations for a new labor contract broke down over wages.