I'm not quite sure which part or to what extent "rogue" applies to, but if the guy is a licensed broker/agent, you can go after him via the state or local licen

I'm not quite sure which part or to what extent "rogue" applies to, but if the guy is a licensed broker/agent, you can go after him via the state or local licensing people - i.e. in California, you could file complaints with the Department of Consumer Affairs and the Department of Real Estate and the National Association of Realtors (if applicable), et cetera.