Related Clues:

• Wedding, say
• Confederacy's counterpart
• The Teamsters, for one
• Association with a common purpose
• 18-Down, for one
• Lincoln's side
• Organizer's organization
• Coupling or merger
• 4th word of our anthem
• Striking group
• Workers' backer
• Group in a striking photo?
• Side of the 1860s
• Marriage, e.g
• Conglomeration