Initiative measure adding Section 23b to Article XII of Constitution. Declares every municipality, county, district and other public agency, created and existing under California laws, owning, operating, managing or controlling any property for supplying light, power, heat, transportation, telegraph or telephone service, to or for the public shall, as to such property and the business conducted therewith, be a public utility, regulated by the State Railroad Commission in all respects, except issuance of securities, as private corporations and natural persons owning, operating or controlling like property for like purpose