From Truthorfiction.com:

.......
Chavez has been president of Venezuela since 1998. One of his first acts was to build relations with Fidel Castro and Cuba and his leftist government has been in the watchful eye of the U.S. ever since. In February, 2006, U.S. Secretary of State Condoleezza Rice said that the Venezuelan government posed "one of the biggest problems" in Latin America, particularly because of its ties with Cuba. Chavez responded with a threat to stop the flow of oil to the U.S., a threat he has made before. Citgo is the American subsidiary of the state-run oil company, Petroleos de Venezuela SA. He has also threatened to block inbound flights to Venezuela from the U.S..

Boycotts of oil companies have been tried on numerous occasions and, so far, without measurable results. Citgo is Venezuelan owned but the majority of the people who would be impacted by a successful boycott are mostly Americans.....

So, be careful who you boycott as you can see the old addage "be careful what you ask for, you just may get it", may apply here.
Food for thought.

<---Guilty of buying oil/gas to pursue free enterprise. Cost of doing business