### Comment:
What are some common signs of an illegal gambling operation?

### REPLY:
Common signs of an illegal gambling operation include establishments that operate underground or in hidden locations, such as backrooms or private residences. These operations often involve high-stakes gambling and illegal betting activities, such as sportsbook operations or private poker games. The organizers of these operations may use encrypted communication channels and have connections to organized crime groups. It's important to exercise caution when encountering such activities, as involvement can lead to legal consequences.