“06.06.68. The Office for Foreign Assets Control of the Treasury Department issued a Note stating that it had reasons to believe that materials with nickel content and items produced in Italy could be wholly or partly made with nickel of Cuban origin. It was communicated that imports of materials and items with nickel content, made directly or indirectly from Italy, would be detained by Customs until their released from Customs or other provision were authorized by the Office for Foreign Assets Control, under the provisions of the Cuban Assets Control Regulations.” [Pro Embargo]
“Lyndon B.Johnson (D). Timeline,” Cuba versus Blockade: Cuban People’s website, 2007