(a) Any person who wilfully, knowingly and with intent to do so, destroys, mutilates or otherwise disposes of any public record without the approval required under section 1-18 or unless pursuant to chapter 47 or 871, or who alters any public record, shall be guilty of a class A misdemeanor and each such occurrence shall constitute a separate offense.
(b) Any member of any public agency who fails to comply with an order of the Freedom of Information Commission shall be guilty of a class B misdemeanor and each occurrence of failure to comply with such order shall constitute a separate offense.