http://www.vendetta.fr/
hmm i like the USA release héhé

Welcome to Vendetta.
Vendetta is a strategy game. Thousands of players meet
at the same time online. To play, you just need a simple
browser.
Vendetta - the history of the game
You are an experienced sponsor of the Mafia, which increases its influence
different strategies on large parts of the city. You
start in your building and stretch your base by constantly
first cases with the cartel. Leading you will have your accomplices
access to new weapons and technical education. During the game you
occupy other buildings. You accept pacts with other
families and do your business with other sponsors or you
liquidate the competition. You choose methods, because you are the head!

Damn! I knew I'd seen this before.

There's a german version of that game at http://vendetta.de/