This was the first attempt to mix social comment and action in a Swedish movie. Bo Widerberg had previously tried, successfully, the social comment. This time he tried action for the first time. And without a doubt he succeeded.
It's about police brutality and a victims attempt to seek revenge. The only trouble is that he doesn't think it's enough to kill the police who was the cause of his anger, but he tries to kill every policeman that comes in sight.
It shows the routines in police-work, as well as fabulous action sequences. The camera-work is brilliant. Notice the sequence when the camera moves backwards with enormous speed in front of the policemen running down the stairs at the subway-station. Steady-cam wasn't invented yet.
Brilliant acting galore. Carl-Gustaf Lindstedt playing the Martin Beck part, was really a comedian, not a serious actor. He did a great job, especially in the balcony scene, which was a very painful experience for him.
If you don't like looking at blood, close your eyes when the curtain opens in the first scene of the film.