Extortion: the practice of obtaining something, especially money, through force or threats. [1]

It's the literal definition of extortion. If you don't give the government your money, they'll [shut your business down|throw you in jail|fine the hell out of you]. The DVD tax is also extortion, but it's more easily justified because there are actual physical things moving through the city's jurisdiction.

1) https://www.google.com/webhp?sourceid=chrome-instant&ion=1&e...