6. Cops Vs. Thugs (1975)
Director: Kinji Fukasaku
A precursor to 1976's Yakuza Graveyard, Cops Vs. Thugs follows the Kurashima City police department's efforts to eradicate organized crime, which aren't all that successful. In Fukasaku's world, money easily sways the law, shedding light on the real-life police system's frail infrastructure against crime.