该片讲述了一个牧羊少年因目睹一起杀人案，竟被人推下悬崖。一个平民在孤独的抗议，被当街射杀，尸体在流血，无人问津。正直的警察局长蓬纳维亚早就对法律的公正丧失信心，雇凶不成，就自己充当杀手，干掉了这一切罪恶的幕后黑手——一个名义上的地产承包商罗蒙诺。而自己在自首后，被买通的犯人在狱中杀害。

克里斯蒂安（罗伯特·霍夫曼饰）和他的女朋友正在一个荒芜的海滩上散步，他们发现一具女人的尸体躺在那里。仔细一看发现她还活着。第二天，克里斯蒂安在游艇派对上再次见到她，他们相爱了。后来在附近的一家汽车旅馆，当他们准备一起上床睡觉时，奇怪的事情发生了：一个入侵者闯入并开始殴打克里斯蒂安，克里斯蒂安不小心用自己的枪向他开枪。几个小时后，他们发现尸体失踪，并发生了一系列奇怪的事件。

Umberto Lenzi is undoubtedly the king of Italian crime movies, but unfortunately; Syndicate Sadists is not the best examples of his work in this genre. Lenzi's crime flicks tend to be a cut above the rest because he makes films based on stories with a point, and they don't lack direction; but this film feels a bit too wayward to fully fit with the rest of his stuff. The film takes obvious influence from Sergio Leone's landmark western 'A Fistful of Dollars' (which in turn, took influence from Akira Kurosawa's landmark samurai flick Yojimbo), in that it features two warring families and a strong character at the centre. The crime that Lenzi focuses on is kidnapping, and we centre on a character called 'Rambo'. Rambo is dragged into the war between the two families after his brother is killed because of it. Rambo uses his brains and brawn to pit the two families against one another, in the hope of gaining revenge for his brother's death, rescuing a young boy that they've kidnapped, and ultimately letting the two sides destroy one another.　　The film's biggest asset is undoubtedly Tomas Milian. Milian was put to great use by Lenzi in almost all of his crime thrillers. The range of characters he has played for Lenzi is immense, and this one is easily one of the coolest. The character is called Rambo, which immediately sprang to mind the popular Sylvester Stallone character - but for once, the Italians actually haven't stolen this name as Syndicate Sadists was released first! As usual, the film is wickedly entertaining, as we get to watch Milian get himself involved in the usual array of car chases, shootouts and brawls. Lenzi has got him riding a motorbike this time round, and every scene featuring it and Milian is a real standout! However, the film often feels like it doesn't really have anywhere to go, and this means that the running time is stretched out more than it should be. Compared to the crime films of other Italian directors, Syndicate Sadists is more than above average; but in relation to Lenzi crime flicks such as Almost Human and The Cynic, The Rat and The Fist - it doesn't stand tall as one of Lenzi's best. Still, if you're looking for ninety minutes of testosterone fuelled mayhem - Syndicate Sadists will suffice!