The union has called for a raise of 12 percent over four years.

In recent history, this union has called two major strikes.

The union has called a meeting of player representatives for tonight.

The union, which was organized in 1945, has never called a strike.

The union, whose members' salaries average $44,000 a year, has called for a 24 percent raise over three years.

However, when their wages are cut, the union calls for a strike.

The union called the order a mistake and said it would appeal today.

The union is calling on Congress to tighten the rules.

The union extended its old contract a few days rather than call a strike.

The union called on subway, electricity and post office workers to walk out for 24 hours next week.