A series of coordinated boycotts are threatening to freeze port operations this week on the East Coast. According to the Associated Press, there were boycotts involving 30 truckers at Port of New Orleans, and 200 at Port Newark.

The Associated Press reported that the owner-operators are discontent over wages, fuel costs and anti-union laws.

According to a release from the American Trucking Associations, flyers were circulating among independent drivers calling for a “nationwide shutdown” of America’s ports in response because “steamship lines have engaged in harsh business practices and received special antitrust exemptions that have combined to establish an increasingly difficult business environment for motor carriers involved in intermodal freight.”

According to Irvinder Dhanda, spokesperson for the owner-operators at the Port of Oakland in California, truckers nationwide face the same issues as in California when owner-operators boycotted the Port in May. “The rates nationwide have not risen for 20 years,” Dhanda said.

The Port of Oakland is currently experiencing no boycott Dhanda said, pointing to rate improvements at the Port since the May work stoppage.