Informant: a person who provides information to authorities.

Betrayer: someone who reveals secrets or betray others.

Snitch: an individual who reports wrongdoing or misconduct of others.

Spy: a covert agent employed to obtain confidential information.

Mole: a secret infiltrator within an organization, gathering intelligence.

Betrayal: To inform or betray someone's secrets to others.

Informant: To act as a spy or informant for authorities.

Collaborate with law enforcement in criminal investigations:

Provide crucial information secretly, especially against criminals

Assist police by providing inside knowledge about illegal activities