Unpredictability is a great weapon in the hands of the workers. Pennsylvania teachers used the Selective Strike to great effect in 1991, when they walked a picketline on Monday and Tuesday, reported for work on Wednesday, struck again on Thursday, and reported for work on Friday and Monday.
This on-again, off-again tactic not only prevented the administrators from hiring scabs to replace the teachers, but also forced administrators who hadn't been in a classroom for years to staff the schools while the teachers were out. The tactic was so effective that the Pennsylvania legislature promptly introduced bills that would outlaw selective strikes.
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