2.2 million? Either imprisonment is all that drives US the economy, or the Americans must have a natural inclination towards criminal behaviour.
How to lay an official complaint to United Nations: http://www2.ohchr.org/english/bodies/petitions/individual.htm
The US has the largest reported incarcerated population in the world, and by far the highest rate of imprisonment, holding 2.2 million people in adult prisons or jails as of year-end 2011. Mass incarceration reflects three decades of harsh state and federal sentencing regimes, including increased use of life and life without parole sentences, high mandatory minimum sentences, and “three strikes” laws. The Sentencing Project reported that one in nine US prisoners are serving a life sentence. Many prisoners and jail inmates—including youth under age 18—are held in solitary confinement, often for weeks or months on end. In July, an estimated 30,000 inmates in California’s prison system engaged in a hunger strike to protest conditions, including the use of solitary confinement. Prolonged solitary confinement is considered ill-treatment under international law and can amount to torture.
Sounds like the US has a bad track record of using solitary confinement for the purposes of torture according to Human Rights organisations and the United Nations Laws. Source: http://www.hrw.org/world-report/2014/country-chapters/united-states?page=1 
