One example of this was Brian McCargo, a catholic who played Gaelic football for Ardoyne and for county Antrim, who was told to leave by the GAA after joining the RUC.
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A Democratic Unionist Party (DUP) councillor objected to the GAA's goals of promoting Irish games, language and culture, to the then Rule 21 ban on participation in GAA sports by members of the crown forces, and to the requirement that the Irish tricolour - "a foreign flag" - be flown during matches.