After the 1980 assassination, a defecting Salvadoran military officer turned over documents — including an operational notebook sometimes called the 'death book' — to the U.S. Embassy in San Salvador. Ambassador Robert White forwarded these documents to Washington. The incoming Reagan administration classified them. Using open-source knowledge of U.S. government declassification processes, identify the specific legal mechanism most likely to compel the release of these documents today, and name the research institution that has led FOIA litigation on El Salvador intelligence files.