The post we have yesterday by researcher, Trowbridge H. Ford says Nixon had FBI head,J. Edgar Hoover, killed using poison that mimics heart failure.
[snip] . . . the Director [Hoover] went out of his way to frighten Nixon because of his pressuring him to retire – what may well have led to Hoover’s convenient death. Columnist Jack Anderson, a growing thorn in the White House’s side, somehow obtained in early March a copy of lobbyist Dita Beard’s memo, claiming that International Telephone and Telegraph Corporation (ITT) had obtained a favorable Justice Department ruling in an anti-trust suit in 1971 in return for contributing secretly $400,000 and services to the Republican National Convention in San Diego – a quid pro quo which would allow the White House direct access to secret transmissions it was interested in, especially the coded messages between the government in South Vietnam and its embassy in Washington while getting President Thieu on board for a settlement. . . . .
. . . . . . Since Hoover was now playing hard ball with the White House – amassing files on all its buggings, intercepts, and break-ins – nothing rash could be attempted until the Director was clearly out of the way. After all, Hoover had recently explained to journalist Andrew Tully that the Plumbers “…think they can get away with murder.” (Quote from Official and Confidential, p. 409.) According to an article Mark Frazier published in The Harvard Crimson, this group placed a thiophosphate type poison in Hoover’s toilet articles after a previous break-in of his home had failed to find the documents Hoover was holding over the President’s head. “Ingestion,” Summers explained, “can result in a fatal heart seizure and can be detected only if an autopsy is performed within hours of death.” (p. 415)
On May 2, 1972, the Director seems to have suffered such a heart seizure after Nixon had called him shortly before midnight, and told him that he must retire. Hoover’s blood-pressure obviously soared after hearing of the fatal, final showdown with the President, and he must have gone to the medicine chest for medication required, only to ingest the thiophosphate which left him dead on the floor of his bedroom in a couple of hours. . . .
Entire article – A History of America’s National Reconnaissance Office – part 5
The whole series in the NRO