This link will show the legislation image:
Chicago City Cemetery, 1837-1869 - Stories
Illinois Legislature Creates the Cemetery
Cemetery Condemned, disinterments begin
- Chicago, Illinois, USA
Condemnations of cemetery lots begins:
I must also add that the actual records are held at the Illinois Regional Archives Depository at Northeastern Illinois University in Chicago. This story was featured on CBS2Chicago News on May 15, 2008. There is so much to glean from the links I posted for the family historian, and one might be able to crack a brick wall or two in his/her research.
This link will take you to some images of documents pertaining to the condemnations, and also images of specific orders of disinterment and re-interment of people as performed by the gatekeeper, L. Shomer, Office of the Commissions of Lincoln Park, Chicago, Illinois