Answer:

union

Answer	Crossword Clue
UNION	Strike force?
UNION	Labor group
UNION	The North, in history

UNION	USA, during the Civil War
UNION	Work organization
UNION	Partnership
UNION	Boys in blue?
UNION	Strike caller
UNION	Dues collector
UNION	Part of USSR
UNION	Labor organization

UNION	USSR part
UNION	AFL-CIO member
UNION	Civil War victors
UNION	Civil War side
UNION	1865 victors
UNION	Concord
UNION	"Liberty and ..., now and forever, one and inseparable"
UNION	Marriage

UNION	Wedding
UNION	Battle of Five Forks victors
UNION	Work group
UNION	Work party
UNION	Workers' group
UNION	Group with a common purpose
UNION	It's composed of chapters
UNION	Togetherness

UNION	Group for people in labor?
UNION	Merger
UNION	Group for ones in labor?
UNION	Shop steward's group
UNION	The Teamsters, e.g.
UNION	Confederacy foe
UNION	Matrimony, for one
UNION	North, once

UNION	U.S.S.R. part
UNION	Lincoln's side
UNION	America, with "the"
UNION	Kind of shop or suit
UNION	"Local" group