Tens of thousands of dockworkers are set to strike on Tuesday morning.

Tens of thousands of dockworkers are on strike, leading to the shutdown of ports along the East Coast and the Gulf, which handle over half of all cargo shipped to the U.S., causing daily disruptions.

The International Longshoremen’s Association announced its first strike in 50 years after it failed to reach a new contract agreement with the U.S. Maritime Alliance.