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Sometimes called “the Alcatraz of the Rockies,” the maximum-security prison holds convicted drug cartel leaders, terrorists, escape artists and other high-profile prisoners who the federal government has deemed pose the highest risk to the public and other inmates.

Exhibit A: Joaquín “El Chapo” Guzmán, longtime leader of the Sinaloa cartel, currently serving a life term under strict isolation at a remote Colorado prison dubbed the “Alcatraz of the Rockies.”

In San Francisco, an inflatable Trump-like chicken decked in black-and-white prison stripes was ferried around the bay on a boat labeled “Alcatraz Prison Transport.”

When David De Clercq traveled to San Francisco last year, he had a few musts on his itinerary: Go to Alcatraz.

After some amount of cajoling, Gubser finally showed up to meet him at the South End Rowing Club, the famed open-water swim club in San Francisco just across the bay from Alcatraz.