Section 131. Duties of commissioner

The commissioner of public safety shall
  have   cognizance,   jurisdiction,   supervision   and  control  of  the
  government, administration, disposition and  discipline  of  the  police
  department, fire department, buildings department and health department,
  and  of  the officers and members of said departments, and shall possess
  and exercise fully and exclusively all powers  and  perform  all  duties
  pertaining   to  the  government,  maintenance  and  direction  of  said
  departments, and  the  apparatus  and  property  thereof  and  buildings
  furnished therefor, and shall have the general direction and supervision
  of  the  expenditure  of all moneys appropriated to said departments. He
  shall possess such other powers and perform such other duties as may  be
  prescribed by the law or by ordinance of the common council.