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The violence in the city broke out in the summer of 1920 , when — in response to the Irish Republican Army ( IRA ) shooting dead a Royal Irish Constabulary ( RIC ) detective in nearby Lisburn — 7,000 Catholics were driven from their jobs in the Belfast shipyards and over 50 people were killed in rioting between Catholics and Protestants .
 Irish Republican Army, Lisburn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Irish Republican Army, Lisburn