This is the US Department of Justice, Federal Bureau of Investigation files on Albert Einstein, obtained through the Freedom of Information Act by Abraham Pais for his seminal biography of Einstein, "Subtle is the Lord". It consists of eleven files of various lengths, composed of 8 1/2 x 11 inch, single-sided photocopies, plus a letter of transmittal from James K. Hall, Chief Freedom of Information, Privacy Acts Section, Records Management Division at the FBI, dated April 18, 1983, informing Pais of the documents enclosed, and the status of Pais' Freedom of Information Act request. Pais was a brilliant physicist, who worked at the Princeton Institute for Advanced Study with Einstein, and knew most of the leading physicists of his time. The FBI had collected this file over a fifty year period of suspicion by J. E. Hoover of Einstein for his liberal opinions, international reputation as a humanitarian, his opposition to the US use of atomic weapons, and his Jewishness. ( )