Minneapolis / Saint Paul:

"Metro Transit pledges that you will have access to all our programs, services and benefits without regard to race, color, national origin, sex, age, disability or socioeconomic status..."

[...]

"If you believe that you have been discriminated against because of your race, color, national origin, sex, age, disability or socioeconomic status, you may file a written complaint with the Metropolitan Council’s Office of Diversity and Equal Opportunity at this address:
Director of Equal Opportunity
Metropolitan Council
230 East Fifth Street
St. Paul, MN 55101"

* * *

Chicago:

"...eliminate all forms of illegal discrimination, fraud and mismanagement of public funds, and support colleagues if they are in difficulty because of responsible efforts to correct such discrimination, fraud, mismanagement or abuse."

...but doesn't seem to have a specific person to contact.