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Betrayer (Noun)

One who reveals confidential information in return for money.

Nouns denoting people.

The company fired John after discovering he was a betrayer who sold their trade secrets to a competitor for a hefty sum.
She was shocked to learn that her former business partner was a betrayer who had been secretly sharing their confidential data with a rival firm.
The government agent was accused of being a betrayer for leaking classified information to the press in exchange for a large payment.
The company's security team worked tirelessly to identify the betrayer who had been selling their sensitive information to a cybercrime group.
After being caught, the betrayer claimed he had been in deep financial trouble and saw selling the confidential information as an easy way out.