It is unlawful for any person not enrolled in any public school of this State to solicit any pupil enrolled therein to join or pledge himself or herself to become a member of any public school fraternity, sorority or secret society or to solicit any such pupil to attend a meeting thereof or any meeting where the joining of any such fraternity, sorority or secret society is encouraged. Whoever violates this section shall be guilty of a petty offense and fined not less than $25 nor more than $100.
105 ILCS 5/31-4