Social scientists have not helped the working class make strategic deci sions. Unionists need to know how to carry on industrial conflict so as to provide concrete economic benefits for their members. Should unions strike or not strike? Should losses be avoided at all costs, or can unions afford to take chances? Does economism gut the class power of workers or provide a pragmatic strategy for increasing workers' wage gains? We can say with great confidence that workers should join unions; there is now an exhaustive and compelling literature demonstrating that union membership provides a wide...