Legal Question in Legal Ethics in Illinois

That depends on a number of factors, like did the realtor represent you or someone else in a transaction, and did you suffer damages. Otherwise, real estate brokers are regulated by the State of Illinois and you can complain to the regulatory/licensing agency. If the realtor is a realtor-broker in a firm, you can certainly make your concerns known to the managing broker. But remember that if you simply say the broker is behaving unethically and you're wrong, you could be opening yourself up to liability for slander.