In May 1996, the Central Intelligence Agency (CIA) released thousands of previously classified documents regarding Raoul Wallenberg, in response to requests filed under the Freedom of Information Act. The documents, along with an investigation conducted by the newsmagazine "US News and World Report", appeared to confirm the long-held suspicion that Wallenberg was an American intelligence asset during his time in Hungary. Wallenberg's name appeared on a roster found in the National Archives which listed the names of operatives associated with the CIA's wartime predecessor, the Office of Strategic Services (OSS). The documents also included a 1954 memo from an anonymous CIA source that identified a Hungarian-exile living in Stockholm who, according to the author, assisted in inserting Wallenberg into Hungary during WWII as an agent of OSS. Another declassified memorandum written in 1990 by the curator of the CIA's Historical Intelligence Collection, William Henhoeffer, characterized the conclusion that Wallenberg was working for the OSS while in Budapest as being "essentially correct".