105 ILCS 5/31-3: Suspension or expulsion of members, pledges and solicitors.

The governing body of any public school shall suspend or expel any pupil who is a member of or joins or promises to join, or who becomes pledged to become a member of, or who solicits any other person to join, promise to join or be pledged to become a member of any public school fraternity, sorority or secret society.