"But the most sinister episode came when a team of CIA officers decided that they could use Donovan’s unique access to Castro to assassinate the Cuban leader. The declassified CIA history mentions only in a footnote on page 137 that “at some point during Donovan’s negotiations with Castro“ several officials in the covert operations division “devised a plan to have Donovan be the unwitting purveyor of a diving suit and breathing apparatus, respectively contaminated with Madura foot fungus and tuberculosis bacteria, as a gift for Castro.“ " (thanks Amir)