“The Blues Brothers had to break many laws in order to pay the Cook County property assessor’s office $5,000 for Sister Mary Stigmata, to save their Catholic orphanage,” Aykroyd says in the ad, in which he is filmed working under the hood of a police squad car. “Thirty-eight years later, the Cook County assessor is still ripping off Chicagoans. Dirty politicians have made a fortune by enforcing unfair tax assessments.