"Anti-Smuggling Group" would be the direct translation of "缉私群" into British English. This term refers to a group or community that collaborates to combat smuggling activities. If you're looking for a more detailed description, it could be something like:

"A community or group dedicated to preventing and combating illegal smuggling activities. Members may share information, resources, and strategies to identify and intercept smugglers, as well as support law enforcement efforts in anti-smuggling operations."

If you need a specific context or application of this term, please provide more details so I can tailor the translation or explanation accordingly.