No idea why this is downvoted; it's the plain truth. The same thing goes for other sanctioned countries: (Cuba, North Korea, Sudan, and Syria), as well as for transactions mentioning sanctioned individuals or organizations.
Cuba was removed from the State Sponsors of Terrorism list in 2015, but it remains under heavy economic sanctions and travel restrictions -- enough so that mentioning "Cuba" or "Havana" in an electronic payment memo will probably get your account locked temporarily while the compliance department takes a look at it.
