A number of incidents stemming from the September 11 attacks have raised questions about legality. These include: * Detentions of U.S. residents soon after the attacks. * Detention and imprisonment of hundreds of people without charges and without following any previously defined standard, such as at Guantanamo Bay, Cuba. * Extraordinary renditions. * Certain actions to increase surveillance and to screen airline passengers. * The U.S.-led invasion of Iraq. * The Abu Ghraib prison scandal. * Allegations of war crimes, including killings of noncombatants. * Waterboarding and other allegations of torture. * US citizens' extensive loss of civil rights under the USA Patriot Act.