A person who knowingly resists or obstructs the performance, or disobeys a direct command by one known to the person to be a peace officer of any authorized act within his official capacity, shall be deemed guilty of a misdemeanor.
('71 Code, § 7-1-40)
No person, upon command, shall refuse or knowingly reasonably fail to aid a person known by him to be a police officer in:
(A) Apprehending a person whom the officer is authorized to apprehend; or
(B) Preventing the commission by another of any offense.
(ILCS Ch. 720, Act 5, § 31-8) Penalty, see § 130.99
A person commits tampering with public notice when he or she knowingly and without lawful authority alter, destroy, deface, remove, or conceal any public notice posted according to law, during the time for which the notice was to remain posted.
(ILCS Ch. 720, Act 5, § 32-9) Penalty, see § 130.99