Some 45,000 union workers walked off the job at seaports on the U.S. East and Gulf Coasts on Oct. 1, cutting off vital trade arteries just weeks ahead of the nation's presidential election.

The last ILA strike on the East Coast, in 1977, ended after 44 days. In 2002, President George W. Bush invoked the Taft-Hartley Act to halt a management lockout of West Coast port workers. Port operator Enstructure wrote last week they'd "continue to provide support services for our customers until regular operations resume."