Definition. Of crime and examples

Crime films are films that focus on the lives of crimminals  The stylistic approach to a crime film varies from realistic portrayals of real-life criminal figures, to the far-fetched evil doings of imaginary arch-villains. 
 

Crime Film Examples:

Fargo - A car salesmen from Minnesota is in debt, so he hires two men to kidnap his wife in order to collect her ransom money.

The Silence of the Lambs - An FBI agent develops a relationship with the notorious serial killer, Dr. Hannibal Lector, to gain Lector’s assistance in the hunt for another serial killer.

Reservoir Dogs - An unacquainted group of professional criminals is brought together for a diamond robbery that goes amiss. 

CRIME GENRE DEFINITION: Crime fiction is the genre of fiction that deals with crimes, their detection, criminals, and their motives. Most - though not all - crime novels crime novels share a common structure. First there is the crime, usually a murder; then there is the investigation; and finally the outcome or judgement, often in the shape of the criminal's arrest or death.

Crime is usually distinguished from mainstream fiction and other genres such as science fiction or historical fiction, but boundaries can be, and indeed are, blurred. The genre's flexibility is perhaps one reason for its wide and enduring appeal and means different things to different people at different times. Unlike some literary fiction, the crime novel retains many of the time-honoured techniques of fiction character, theme, narrative, tension, etc

There is now such a huge variety within the genre, it also has several sub-genres, including detective fiction (including the classic whodunnit), legal thriller, courtroom drama, hard-boiled fiction, Police Procedurals, Private Eye, Suspense, Thrillers and any other sub-genre in which a committed crime is the leading motivator of the plot. Indeed There are novels where the hero is the criminal not the detective.

All one can with any certainty is that the labelcrime fiction is a resilient convenience for those who use it, not an exact term.