An Act amending the act of August 10, 1951 (P. L. 1189, No. 265), entitled, as amended, "An act regulating the appointment, promotion, suspension, reduction, removal and reinstatement of employes (except superintendents, assistant superintendents, inspectors, chief clerks and school guards) in bureaus of police in cities of the second class;....," providing for authorization for second class cities that are home rule municipalities to enact, by referendum, alternate means of police discipline and regulation.