Filing pleadings that revealed a client’s business secrets, divulging emails that contained a divorcing couple’s confidential mental health information and launching into what one judge called an “unhinged attack” on an expert witness are among the disciplinary charges facing Chicago attorney Joel A. Brodsky.The Illinois Supreme Court this week suspended Brodsky, a sole practitioner, on an interim basis for his conduct in three cases. One of those cases, in which he baselessly accused opposing …