A neo-Nazi “active club” counts several current and former members of the United States military as its members, the Guardian has learned, including a lance corporal machine gunner currently in detention on insubordination charges and a former US Marine Corps staff sergeant who was booted from the service for stealing large quantities of ammunition.
I think he means that they’re only ‘active’ because they’re in detention, but they’re not ‘active’ in the sense that we normally think of it as in actively serving in a role.
Sort of like saying that residents of a town are gang affiliated when they’re only there because that’s where the prison is located.