Many today will view it with some degree of incredulity, but there was a time when the GAA prohibited its members from playing or attending 'foreign sports' such as soccer, cricket, rugby and hockey.
Of course, a few did pay little heed to the dictate from on high and partook in those banned sports, changing their names in the process so as to not incur the wrath later on. Not all got away with it.
Rule 27, the ban on foreign games, was a cornerstone of the GAA until it was removed at Congress on this weekend in 1971. Delegates at Queen's University, Belfast, voted to delete the 'ban' from the GAA's constitution.
Fifty years on, RTE's Sunday Sport remembers that Easter Weekend and hears from then president Pat Fanning, who while personally in favour of retaining the ban, spoke eloquently from the floor just before its deletion.
Also on the programme is historian Mark Duncan, who pointed out that it's important not to look at Rule 27 through a 21st century lens.
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This piece was aired on RTÉ Radio 1's Sunday Sport on 11 April 2021.