Pohl, Frederik: The Day of the Boomer Dukes

A delightful time travel romp. What happens when a bored criminal from the future returns to a more exciting time in the past? Foraminifera 9-Hart Bailey's Beam is about to find out. He's gathered a cash of high tech weapons to take back in time with him. His intention is to team up with the legendary New York Mafia. Upon arriving in our time he meets a street gang named The Boomer Dukes and he asks them to "take me to your Mafia." from there nothing goes as planned.