If they do, the union would challenge their ability to do so.

The Orioles are trying to void his contract and avoid paying him $11 million, but the union has challenged their action.

The union is challenging the state law in court.

A union representing some staff is challenging seven of the suspensions.

In 2007, however, the owners can eliminate two teams with the assurance that the union will not challenge their action.

But experts in such negotiations suggest that unions could still challenge these extras.

"We won't let them get away with it," Fehr said without indicating how the union would challenge the move.

The state employees' union challenged the privatization plan in the court.

Now the union also challenges the accuracy of the system.

For one thing, once the union challenged the clubs' action, the owners would have to prove they had negotiated in good faith.