The nation's fastest growing labor union just got bigger.

About 150,000 breakaway members of the trade union UNITE HERE have formed a new organization and say they will affiliate with the Service Employees International Union.

The influx of textile, restaurant and hotel employees will push SEIU's membership to nearly 2.2 million workers.

UNITE HERE was the product of two unions that merged five years ago. But a culture clash produced months of infighting that divided its 400,000 members into two factions.

The dissident workers are calling their new union Workers United.

Some critics say SEIU president Andy Stern encouraged the rift by luring the breakaway group to join his union. Stern denies that.