### Comment:
What are the common types of illegal gambling operations?

### REPLY:
Common types of illegal gambling operations include bookmaking, underground casinos, sports betting rings, and online gambling sites that operate without proper licensing. Bookmaking involves taking bets and setting odds on various events. Underground casinos are illegal gambling establishments that operate outside of the legal framework. Sports betting rings involve illegal gambling on sports events, often with the involvement of organized crime networks. Online gambling sites that operate without proper licensing can facilitate illegal gambling activities and are often associated with fraud and money laundering.