maximum-security

[ mak-suh-muh m-si-kyoo r-i-tee ]

/ ˈmæk sə məm sɪˈkyʊər ɪ ti /

designed for or housing prisoners regarded as being very dangerous to society.

Origin of maximum-security

First recorded in 1965–70

Livvix, 30, is now in solitary confinement in the maximum-security Ayalon prison in Ramla, a city near Tel Aviv.

The Strange Case of the Christian Zionist Terrorist |Creede Newton |December 14, 2014 |DAILY BEAST
I recently visited Graterford, a maximum-security state penitentiary in Pennsylvania, 30 miles from Philadelphia.

Here’s a Reform Even the Koch Brothers and George Soros Can Agree On |Tina Brown |November 10, 2014 |DAILY BEAST
It was a high-tech attempt to smuggle in drugs and phones from the skies over a maximum-security facility.

What Was This Drone Doing Over a South Carolina Prison? |Melissa Leon |August 1, 2014 |DAILY BEAST
And they will not be in the same kind of custody, maximum-security custody.

Bergdahl Deal Could Be First Step to Emptying Gitmo |Josh Rogin |June 2, 2014 |DAILY BEAST

Moving them to a maximum-security prison without trial simply substitutes Gitmo North for Gitmo South.

Obama, Not Congress, Is the Reason Guantánamo Is Still Open |Thomas Joscelyn |May 3, 2013 |DAILY BEAST
Yes; I do—there are many maximums—I have 450 maximum-security cells that's the latest that can be built.

Warren Commission (12 of 26): Hearings Vol. XII (of 15) |The President's Commission on the Assassination of President Kennedy