The General Assembly of the Commonwealth of Pennsylvania declares that it is the public policy of this Commonwealth and the purpose of this act to promote orderly and constructive relationships between all public employers and their employes subject, however, to the paramount right of the citizens of this Commonwealth to keep inviolate the guarantees for their health, safety and welfare. Unresolved disputes between the public employer and its employes are injurious to the public and the General Assembly is therefore aware that adequate means must be established for minimizing them and providing for their resolution. Within the limitations imposed upon the governmental processes by these rights of the public at large and recognizing that harmonious relationships are required between the public employer and its employes, the General Assembly has determined that the overall policy may best be accomplished by (1) granting to public employes the right to organize and choose freely their representatives; (2) requiring public employers to negotiate and bargain with employe organizations representing public employes and to enter into written agreements evidencing the result of such bargaining; and (3) establishing procedures to provide for the protection of the rights of the public employe, the public employer and the public at large.