1. The union leaders called a strike.

2. The workers answered by calling a strike.

3. The union has backed away from calling a strike.

4. Air France pilots called a strike over the European harmonisation of their working hours.

5. The union cannot call a strike unless it holds a ballot of members.

6. It's reckoned that the unions will call a strike if management will not agree to their demands.

7. When union bosses called a strike in protest over low pay,[http://] the response was overwhelming.

8. If I had let it go, it would have been called a strike.

9. The workers determined to call a strike.

10. They will call a strike if they don't get more money.

11. I'll call a strike to protest against the job cuts in our company.

12. The militants might still find some new excuse to call a strike.

13. They now have to ballot their members before being able to call a strike.

14. The trade union is invested with the power to call a strike.