Still classified, I bet. Some of Hoover's COINTELPRO operations were still running then, and one or more of those espousing the most violent acts may have been an Army or FBI agent provocateur. I seem to recall a bombing in a Boston airport or train station in the same time period, 1972-'74 or thereabouts, and both the OPERATION WATCH TOWER and OPERATION CANTON SONG projects, both very highly classified, followed circa 1975-'76. See also the Justice Department's DE FEO REPORT, named for the Justice Department investigator probing DEA plans to assassinate foreign heads of state, including Panamanian dictator Omar Torrijos and Manuel *Noryago*, run by DEA/military spook Lucian *Black Luigi* Conein.
Lou Conein, 1962-63: