Make an example of somebody
Definition 1 of 2
Pro Tip 1/3Consequence Warning
Used to signal a consequence that serves as a warning to discourage similar behavior. 
Management decided to make an example of the latecomer to enforce punctuality.
Pro Tip 2/3Authority's Message
Reflects an authority's stern message that rules must be followed. 
The coach made an example of the player to show his no-tolerance policy for misconduct.
Pro Tip 3/3Public Deterrent
Punishment is often public to ensure the message is seen and understood by all. 
The principal made an example of the pranksters in front of the whole school.