Extraordinary rendition — the abduction of foreigners, often innocent ones, by American agents who sent them to countries well known for torturing prisoners — was central to President George W. Bush’s antiterrorism policy. His administration then used wildly broad claims of state secrets to thwart any accountability for this immoral practice.

President Obama has adopted the same legal tactic of using the secrecy privilege to kill lawsuits. So the only hope was that the courts would not permit these widely known abuses of power to go unchecked.

Last Monday, the Supreme Court abdicated that duty. It declined to review a case brought by five individuals who say — credibly — that they were kidnapped and tortured in overseas prisons. The question was whether people injured by illegal interrogation and detention should be allowed their day in court or summarily tossed out.

The court’s choice is a major stain on American justice. By slamming its door on these victims without explanation, it removed the essential judicial block against the executive branch’s use of claims of secrecy to cover up misconduct that shocks the conscience. It has further diminished any hope of obtaining a definitive ruling that the government’s conduct was illegal — a vital step for repairing damage and preventing future abuses.