Independence Hall Association
U.s. History: Labor vs. Management
As Big Business grew in the Gilded Age, so did conflict between the workers and management. Read about the techniques used by both groups to try to press their points and get the upper hand in negotiations.
Cornell University
Cornell University: Law School: "Nonenforceability of Undertakings in Conflict"
This site, entitled "Sec. 103. - Nonenforceability of undertakings in conflict with public policy; ''yellow dog'' contracts," is from the Legal Information Institute and explains Section 103 of employer/employee jurisdiction.