The union representing them threatened a strike over the issue in 2005.

That deal was struck at the last minute after the union threatened to strike.

The union had threatened a strike against that company beginning Sunday morning.

The union threatened to sue if the policy was not changed by today.

The union this week threatened strikes over the pension plan.

The unions threatened further action if their demands were not met.

After 20 months without a contract, many unions would be threatening a strike.

The officers' union has threatened legal action to block the proposal.

The union threatened to ban him from all future projects in Egypt.

The truck drivers' union had threatened that its strike would go on for three months.