Section 3-303. Bureaus in office of comptroller

There shall be four bureaus
  in the office of the comptroller:
    1. A bureau of accountancy, the chief officer of which shall be called
  chief  accountant.  The  bureau  shall  include  a  central   accounting
  division, and shall determine the form of the accounts in the department
  of  finance  and  other  agencies,  and shall also direct the accounting
  procedure therein in accordance with the requirements of the charter.
    2. A bureau of audit, the chief officer of which shall be called chief
  auditor of accounts. Such bureau shall  audit,  revise  and  settle  all
  accounts  in  which  the  city is concerned as debtor or creditor except
  accounts in relation to excise or nonproperty taxes. Such  bureau  shall
  keep  an account of each such claim for and against the city, and of the
  sums allowed upon each, and certify the same to  the  comptroller,  with
  the reasons for the allowance.
    3. A bureau of law and adjustment, the head of which shall be known as
  chief of the bureau of law and adjustment. Such bureau shall investigate
  and  report  to  the  comptroller  for adjustment all awards made in any
  proceeding, and all disputed claims for  or  against  the  city,  except
  proceedings  and  disputed  claims  in relation to excise or nonproperty
  taxes. It shall also investigate complaints alleging  violation  of  the
  labor law and report thereon to the comptroller.
    4.  A  bureau  of  municipal  investigation  and statistics, the chief
  officer of which  shall  be  called  the  supervising  statistician  and
  examiner. Such bureau shall determine the scope of and the form in which
  statistical  information  shall  be compiled and furnished under section
  3-312 of the code, and shall compile and  collate  all  such  facts  and
  statistics  and  make  report  to the comptroller concerning the same at
  least once annually and oftener, if required by the  comptroller,  which
  reports  shall be published in the City Record. Such bureau shall be the
  custodian of and shall conveniently locate for reference all records  of
  the  city.  Books  or  records,  however,  shall not be removed from the
  custody of any other agency while such book or record is of use to  such
  agency  in  the  performance  of  official  duty. All books, records and
  reports in the custody of such bureau, and  all  reports  made  by  such
  bureau  to  the  comptroller,  except  reports  upon  investigations  of
  criminal acts, or reports upon investigations to aid in the  defense  of
  actions  at  law  brought  against the city, before such acts or actions
  have been reviewed by the courts, shall  be  accessible  to  the  public
  under  proper  regulations  for  the protection of the same from loss or
  defacement,  and  certified  copies  thereof  shall  be   furnished   to
  applicants upon the payment of fees, as provided by law.