The United States' Social Security Administration paid 20.2 million dollars (£13.2 million) in benefits to more than 130 suspected Nazi war criminals, SS guards, and others who may have taken part in atrocities during the Second World War, a watchdog has found.
The watchdog's report, scheduled for public release this week and obtained by the Associated Press, used computer-processed data and other internal agency records to develop a comprehensive picture of the total number of Nazi suspects who received benefits and the dollar amounts paid out.
The Social Security Administration last year refused AP's request for those figures.
The payments are far greater than previously estimated and occurred between February 1962 and January 2015, when a new law called the No Social Security for Nazis Act kicked in and ended retirement payments for four beneficiaries. The report does not include the names of any Nazi suspects who received benefits.
The large amount of the benefits and their duration illustrate how unaware the American public was of the influx of Nazi persecutors into the US, with estimates ranging as high as 10,000. Many lied about their Nazi pasts to get into the US and even became American citizens. They got jobs and said little about what they did during the war.
Yet the US was slow to react. It wasn't until 1979 that a special Nazi-hunting unit, the Office of Special Investigations, was created within the Justice Department.
Democratic representative Carolyn Maloney requested that the Social Security Administration's inspector general look into the scope of the payments following AP's investigation, which was published in October 2014.
On Saturday, she said the IG's report showed that 133 alleged and confirmed Nazis actively worked to conceal their true identities from the US government and still received Social Security payments.
"We must continue working to remember the tragedy of the Holocaust and hold those responsible accountable," Maloney said in a statement. "One way to do that is by providing as much information to the public as possible. This report hopefully provides some clarity."
AP found that the Justice Department used a legal loophole to persuade Nazi suspects to leave the US in exchange for Social Security benefits. If they agreed to go voluntarily, or simply fled the country before being deported, they could keep their benefits. The Justice Department denied using Social Security payments as a way to expel former Nazis.
By March 1999, 28 suspected Nazi criminals had collected 1.5 million dollars (£981,000) in Social Security payments after their removal from the US. Since then, AP estimated the amount paid out had grown substantially.
That estimate is based on the number of suspects who qualified and the three decades that have passed since the first former Nazis, Arthur Rudolph and John Avdzej, signed agreements that required them to leave the country but ensured their benefits would continue.
The IG's report said 5.6 million dollars (£3.6m) was paid to 38 former Nazis before they were deported. Ninety five Nazi suspects who were not deported but were alleged or found to have participated in the Nazi persecution received 14.5 million dollars (£9.5m) in benefits, according to the report.