Al Capone became well-known for being a crime boss in Chicago when alcohol was illegal.

这段话是说：阿尔·卡彭是芝加哥有名的犯罪大佬。

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The IRA wants him back (he knows too much) and the local crime boss, Meehan, will only help him if he performs one last hit, on a rival crime boss.

IRA希望他(他知道的太多)，犯罪的老板，米汉，只会帮助他，如果他执行最后一击，在对手的罪行上司。

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Nick fights to not lose his loved ones, while trying to stay in good grace with the very powerful local crime boss. All the while, still trying to figure out who he is in life.

尼克战斗不会失去他的亲人，而试图保持良好的宽限期，具有非常强大的地方犯罪的老板。

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The Departed, directed by Martin Scorsese, features Jack Nicholson as crime boss Frank Costello.

NPR: Ensemble Films Fill the Screen with Cameos

Federal officials agree that Guzman should be considered a Chicago crime boss, despite his removed location.

BBC: Chicago names Joaquin Guzman public enemy No. 1

Tom Wilkinson plays an Italian crime boss -- how did they think of that?

WSJ: Holy Melancholy, 'Batman'!