Oh? Then please share your definition, as I'm working off the basis that it's something like this[1]:

Extortion (also called shakedown, outwresting, and exaction) is a criminal offence of unlawfully obtaining money, property, or services from a person, entity, or institution, through coercion. Refraining from doing harm is sometimes euphemistically called protection.

[1]: http://en.wikipedia.org/wiki/Extortion