“08.07.63 Passage of the Regulations for Cuban Assets Control (28 FR 6974; 31 CFR Part 515), issued on 3 June 1963, in place of the Cuban Imports Regulations of 6 February 1962. They set forth the applicable regime for all commercial and financial transactions with Cuba, including those involving American citizens or companies based abroad or companies owned or controlled by American citizens, and blocked around US$30 million worth of Cuban assets in the United States. These Regulations specifically left the control of the blockade on exports to Cuba to the Exports Control Regulations…” [Pro Embargo]

“John F. Kennedy (D). Timeline,” Cuba versus Blockade: Cuban People’s website, 2007