Final answer:
Wildcat strikes occur without the approval of union leadership and are spontaneous actions taken by a group of workers.
Step-by-step explanation:
Wildcat strikes occur without the approval of union leadership.
Unlike other types of strikes, wildcat strikes are not organized or sanctioned by the union leadership. They are spontaneous actions taken by a group of workers to protest work conditions or make demands without going through the proper channels.
For example, during World War II, unionized workers agreed not to strike in order to keep production going and support the war effort.