Locked the thread. This has already been settled.
Being in a large group, maybe a CP would sorta find that suspicious, especially if whispering is involved. Then you may get told to split up and isolate from the area. Other reasons is if you are near an area which is:
A: Considered suspicious
B: A anti-civil activity happened in the area recently
C: Something is in progress in the localized area currently and thus CPs are trying to get all citizens away from the area entirely.
In short, CPs will isolate people in large groups or those in areas which are currently under investigation/anti-civil activity ongoing/recent. Better to go to a building or rp hub for large gatherings instead, just out on the streets or public zones, CPs may get a bit suspicious and thus thin the crowd.
When CPs allow large groups to "RP" in public zones, it basically allows said groups to just organize in the open and start riots. In short, it depends on the circumstance.
In the end, its individually based, not faction based. If a unit does it to you out of the blue for little to no reason, then yeah, grab the units tagline and give it to the leads so they can investigate and find out why. This is not a faction wide issue. Isolation from my own experience playing citizen 80% of the time has not even happened anyway. And the instances where isolation does happen, it has been for good reasons thus far.