The Mishne Ugemora section of Waldheim is a portion owned by a synagogue on the North Side of the city of Chicago. Many people buried there though had no connection to the synagogue. We have a huge group of family members buried there who were not connected to the synagogue.
The synagogue is still in operation (though just barely) and it does maintain at least some records of the cemetery.
The synagogue's information is:
Cong. Mishne U'gmoro
6045 N. California Ave
Chicago, IL 60659
Good luck to you.