Museum of unintended consequences/Blowback phenomenon

From CSWiki

In CIA jargon, "blowback" describes the phenomenon of supporting a foreign regime or terrorist entity, on the principle that your enemy's enemy is your friend, only to have it attack you, often with the weapons and resources you gave it. Examples include:

• US support of Colonel Manuel Noriega
• US support of Saddam Hussein
• US support of the Mujaheddin in Afghanistan, most notably Osama bin Laden, and later the Taliban
• Allied support of Ho Chi Minh and the Vietminh against the Japanese in WWII.

(Source: from http://en.wikipedia.org/wiki/Unintended_consequence)