Movies related to mass murder :

GoodFellas
8.457
Watchmen

Watchmen

7.3
The Menu

The Menu

7.178
Jack Reacher
6.6
The Sadness
6.794
We Need to Talk About Kevin
7.55
To Catch a Killer
6.887
The Host

The Host

6.3
Moonraker
6.17
The Spy Who Loved Me
6.802