Unionized dockworkers at 36 East and Gulf Coast ports went on strike early Tuesday amid an impasse in negotiations over a new contract with a group representing port employers. The International Longshoremen's Association (ILA), which represents 45,000 dockworkers, began its first strike since 1977 after its six-year contract with the U.S. Maritime Alliance (USMX), which represents port employers, expired Monday night. Negotiations between the ILA and USMX have been deadlocked...