Union members walk a picket line during a strike near APM Terminals in Los Angeles in this file photo

 
Union members walk a picket line during a strike near APM Terminals in Los Angeles in this file photo
Members of the International Longshore and Warehouse Union Local 63 Office Clerical Unit walk a picket line during a strike near APM Terminals in Los Angeles, California in this file photo from December 2, 2012. REUTERS/Jonathan Alcorn/Files