A search of the agency's main index of the subjects of FBI investigations found some records tied to Cronkite's name were destroyed in October 2007, the FBI said in response to a Freedom of Information Act request by USA TODAY. Cronkite's death in July at age 92 made any FBI files about him available for release under the federal law.

The FBI should have preserved records about Cronkite, who anchored CBS' newscasts from 1962 to 1981, said Scott Hodes, a former top lawyer in the FBI's records office. All FBI records on such a prominent person should have been saved under the FBI's policies, Hodes said.