Someone asked on Reddit about Secret Societies in Traveller. Here's what I responded with:
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*In Your Traveller Universe
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- The Ine Givar (Zhodani loving terrorists) were supposed to be secret until revealed.
- Psionics Institutes are supposed to be secret since they're illegal.
- The Illuminati? That could still be around.
- Joe's Starport Gambling Den is not so much secret as you have to be on the list.
- Pirates, Thieves, and other Criminals are secretive until they're not any more.
- What's really the difference between a Private Club and a Secret Club?
- Is it more important that the activities are secret?
*In Your Traveller Universe