All of the 'Six Degrees of Separation'/Kevin Bacon mental gamesmanship generated by a star-studded ensemble cast could detract from the simple, propulsive narrative drive of a film like 'Brooklyn's Finest,' but director Antoine Fuqua ('Training Day') boldly dares audiences to play the game anyway. And, for the most part, his gambit pays off. It's a fine example of a filmmaker abiding by the law of the streets. Grade: B-plus.