The City Manager is hereby authorized and directed to adopt, promulgate, amend and enforce such administrative rules and regulations as shall be necessary to execute and enforce the provisions of this chapter. The violation of any such rule by any licensee, his agent or servant, shall be sufficient cause for the revocation of such license or licenses held by such violator, when, in the discretion of the City Manager, such violation justifies the revocation of such license or licenses. The City Manager is further authorized to suspend, for such time as he shall deem proper, the effectiveness of any license issued hereunder for the violation of any rule adopted and promulgated under the provisions of this section.