"Restrictions on travel to Cuba have been a key and often contentious component in U.S. efforts to isolate Cuba's communist government since the early 1960s. Restrictions on travel and remittances to Cuba are part of the Cuban Assets Control Regulations (CACR), the overall embargo regulations administered by the Treasury Department's Office of Foreign Assets Control (OFAC). In 2004, under the George W. Bush Administration, restrictions on family and educational travel and on private remittances to Cuba were tightened significantly. Initially there was a mixed reaction to the Bush Administration's actions, but opposition to the policy grew."
CRS Report for Congress, RL31139