American Maritime Officers
Based in United States of America, Dania Beach
IAM
Based in United States of America, Upper Marlboro
International Longshore and Warehouse Union
Based in United States of America, San Francisco
International Longshoremen's Association
Based in United States of America, North Bergen
International Organization of Masters, Mates & Pilots, AFL-CIO
Based in United States of America, Linthicum Heights
Marine Engineers' Beneficial Association
Based in United States of America, Washington DC
Seafarers' International Union
Based in United States of America, Camp Springs