In 1990, several school employees filed suit against the Terrebonne Parish School Board. The employees won; among other things the Davis v. Henry case established that public employees have "the same right to engage in collective bargaining as held by their counterparts in the private sector."
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Sources:
1. Davis v. Henry, Supreme Court of Louisiana, 555 So. 2d 457 (1990)
2. Public Sector Labor Law: An Update, John Lund and Cheryl L. Maranto,1996.