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In 2009 , Sinn Féin MLA Martin McGuinness used the term in denouncing Lord Mayor of Dublin Eibhlin Byrne who had suggested it was " unpatriotic " for people from the Republic of Ireland to go shopping for cheaper prices in Northern Ireland .
 Sinn Féin, Martin McGuinness, Eibhlin Byrne, Northern
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sinn Féin, Martin McGuinness, Eibhlin Byrne, Northern