Any citizen may type CW to list all visible/proximate citizens (i..e. players from the same homeland) in Avalon at that particular time. Youngsters and those of the Public Relations Ministry can type CITIZENS to list not only their own fellow citizens but also relations ministry representatives from foreign cities and towns. Barons may type CITIZENS LIST to list all active citizens of their town, or CITIZENS DORMANT to list all dormant citizens. Active citizens are players who have entered Avalon at least once over the past month. CITIZENS ALL will give a complete list of all citizens, active or dormant, of your city. The government has the ability to initiate new citizens and oust existing ones.
Typing CITIZEN followed by an individual will give citizenship of your homeland to another individual, while UNCITIZEN followed by an individual will strip them of citizenship. It is not possible to cast out a citizen whose time in the city has gone beyond a certain length of time - the theory being their affiliation, their very blood, is too closely 'citizen' so as to transcend mere title/simple command. It is also not possible for some high ranked citizens to be ousted from the city by fellows without sufficiently high rank; and the noble ranks Count and Duke are likewise shielded from easy uncitizen'ing.
If the situation becomes so grave the long-time or high rank/noble citizen is determined a threat to the city there is one option available to the Prince, leadership (city constitution permitting) and Cardinal: exile. Exile is explained in detail in HELP EXILE. The stigma and consequences are considered extremely serious: damning to the individual exiled. The decision to issue an order of exile also reflects permanently on the Prince or city leader responsible. Do not open this can o'worms lightly.
As a safeguard in the democracies, you cannot oust a citizen who has questioned you or one of your competitors in an election. Most of the time, the three cities are democracies and the villages are little monarchies.