[Answer] Known as "The Rock", what famous prison housed inmates such as Al Capone, and "Machine Gun" Kelly?

Step 1 : Introduction to the question "Known as "The Rock", what famous prison housed inmates such as Al Capone, and "Machine Gun" Kelly?"

..."The Rock", officially known as Alcatraz Federal Penitentiary, was the country's first maximum-security prison. Located 1.25 miles off the coast of San Francisco, prison operators believed Alcatraz to be escape-proof and America's strongest prison. Notable inmates included Chicago mobster Al Capone, George "Machine Gun" Kelly, and Robert Stroud, the man known as the "Birdman of Alcatraz." Today, Alcatraz is a public museum and one of San Francisco's major tourist attractions, attracting some 1.5 million visitors annually.

Step 2 : Answer to the question "Known as "The Rock", what famous prison housed inmates such as Al Capone, and "Machine Gun" Kelly?"

Alcatraz:

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