Re: Is worf a Federation Citizen
As for citizenship, it's far from certain that the Klingon Empire even recognizes the concept. Klingons are Klingons - they don't hold "citizenships" or other such alien nonsense. If they are caught doing something against Klingon law or tradition, Klingons will come and judge them no matter what, where or with whom.
Yet in "Sins of the Father", it's said that Worf is safe from Klingon justice as long as he's in the Federation.
"Pitching is simple -- cheese for the kitchen and a yakker for the kudo." - Dennis Eckersley