Keith Zimmerman Books

Operation family secrets
Operation family secrets

By Calabrese Frank Jr

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While in prison with his father, Frank Calabrese Sr., on racketeering charges, Frank Jr, a former member of the Chicago crime syndicate known as the Outfit, offered to help the FBI keep his father...

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Operation Family Secrets
Operation Family Secrets

By

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The chilling true story of how the son of the most violent mobster in Chicago helped bring down the last great American crime syndicate: the one-hundred-year-old Chicago Outfit.In Operation Family...

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Rotten
Rotten

By John Lydon, Kent Zimmerman, Keith Zimmerman

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H unit
H unit

By Keith Zimmerman

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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