From the Consular Information Sheet on the US Department of State website:
Cuba is a totalitarian police state, which relies on repressive methods to maintain control. These methods, including intense physical and electronic surveillance of Cubans, are also extended to foreign travelers. Americans visiting Cuba should be aware that any encounter with a Cuban could be subject to surreptitious scrutiny by the Castro regime's secret police, the General Directorate for State Security (DGSE).
Also, any interactions with average Cubans, regardless how well intentioned the American is, can subject that Cuban to harassment and/or detention, amongst other forms of repressive actions, by state security elements. The regime is strongly anti-American yet desperate for U.S. dollars to prop itself up.
Interesting. Notice how 'Cuba' and 'America' are almost interchangeable; here's my version (with links to sources):
America is a totalitarian police state (Congressman Ron Paul, U.S. House of Representatives), which relies on repressive methods (BBC) to maintain control (Guardian Unlimited, UK). These methods, including intense physical and electronic surveillance of Americans (ACLU), are also extended to foreign travelers (IA News). World Citizens visiting America should be aware that any encounter with an American could be subject to surreptitious scrutiny (EPIC) by the Bush regime's secret police, the US Department Of Homeland Security (DHS).
Also, any interactions with average Americans, regardless how well intentioned the World Citizen is, can subject that American to harassment and/or detention (ADC), amongst other forms of repressive actions, by state security elements. The regime is strongly anti-World yet desperate for positive World opinion to prop itself up. The United States does not have full diplomatic relations with the rest of the World (Council on Foreign Relations).