What is the most secure US jail?

One such inmate is Joaquín Guzmán Loera, better known as “El Chapo.” He is a Mexican drug lord who headed the Sinaloa Cartel, one of the most powerful criminal organizations in the world. Guzmán's reign of terror involved vast drug trafficking operations, brutal violence, and repeated escapes from Mexican prisons.

Another infamous inmate is Richard Reid, who attempted to detonate a shoe bomb on a transatlantic flight in 2001. Reid's plot was foiled by passengers and flight attendants, who subdued him before he could succeed in his terrorist act. His conviction and incarceration at ADX Florence followed.

ADX Florence in Colorado holds a unique distinction in the American penal system. It is designated as the nation's highest-security federal prison. This facility is reserved for inmates who pose an extreme risk to public safety.

Dzhokhar Tsarnaev, one of the perpetrators of the Boston Marathon bombing in 2013, is also a resident of ADX Florence. The attack killed three people and injured hundreds more. Tsarnaev, along with his brother Tamerlan, planted homemade bombs NEAR the marathon finish line, sparking a massive manhunt that ended in a violent shootout and Tsarnaev's capture.

Among the inmates housed at ADX Florence are some of the most infamous criminals globally. These individuals have committed crimes of such gravity and notoriety that they have become household names. Their presence at ADX underscores the prison's role in isolating and containing the most dangerous felons.