Nearly 50,000 members of the International Longshoremen’s Association (ILA) are on strike Tuesday against the nation’s East and Gulf Coast ports, choking off the flow of many of America’s imports and exports in what could become the country’s most disruptive work stoppage in decades.

Dozens of ports along the East and Gulf coasts of the US have shut down as thousands of dock workers strike over wages and technology that could replace jobs, according to CNBC. The strike, which began just past midnight on October 1st,

The strike is the first along ports on the East Coast in nearly 50 years, potentially crippling several industries.