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Similar to this question here, is there any reason why Frank Costello does not speak with an Irish accent in The Departed, like Pierce Brosnan does in The Foreigner (2017)?
In the film Costello grew up from an Irish Catholic family.
It's the same the world over, you speak the language and accent of where you were raised not that of your parents or grandparents.
Hennessy is an Irishman.
Costello is an American, of Irish ancestry.