Cuba threat over Christmas lights

What does Cuba's communist regime have in common with the American Civil Liberties Union? Here is one hint: it has to do with christmas.

Cuba's most senior US diplomat says he has been warned by the government of serious consequences unless he takes down Christmas decorations in Havana.
James Cason says he will not remove the display at the American interests section, which includes a reference to 75 dissidents jailed last year.
Fourteen have been freed since the arrests took place in March 2003, in a major clampdown on political dissent. Cuba has twice told US diplomats to remove all decorations immediately. It describes those it jailed as "mercenaries in the pay of the United States".