The Justice Department report, describing what it calls “the government’s collaboration with persecutors,” says that O.S.I investigators learned that some of the Nazis “were indeed knowingly granted entry” to the United States, even though government officials were aware of their pasts. “America, which prided itself on being a safe haven for the persecuted, became — in some small measure — a safe haven for persecutors as well,” it said…

In chronicling the cases of Nazis who were aided by American intelligence officials, the report cites help that C.I.A. officials provided in 1954 to Otto Von Bolschwing, an associate of Adolf Eichmann who had helped develop the initial plans “to purge Germany of the Jews” and who later worked for the C.I.A. in the United States. In a chain of memos, C.I.A. officials debated what to do if Von Bolschwing were confronted about his past — whether to deny any Nazi affiliation or “explain it away on the basis of extenuating circumstances,” the report said.

The Justice Department, after learning of Von Bolschwing’s Nazi ties, sought to deport him in 1981. He died that year at age 72…

The secrecy surrounding the Justice Department’s handling of the report could pose a political dilemma for President Obama because of his pledge to run the most transparent administration in history. Mr. Obama chose the Justice Department to coordinate the opening of government records.