Slave Trade

Definitions:
1.The business of buying and selling people for profit. (wikianswers)
2.Traffic in slaves; especially in Black Africans transported to America in the 16th to 19th centuriest
(http://www.thefreedictionary.com/slave+trade)
Explanation:

The violent kidnapping of colored people to use as labour workers in hard working conditions to make profit. The black Africans were transported over seas to America.
Metaphor:
Any movie that features white people sailing off to the Third World to capture something living and carry it back to the West for exploitation is going to be seen as a metaphor for colonialism and racism. A good example of this is the movie King Kong. They captured the giant gorilla and took him back to their country to exploit him and make a profit off of him.