watchdog
n. countablen. an organization or person that makes sure companies or governments follow the rules. They protect the public by reporting any bad behavior or mistakes.
n. an independent person or body established to monitor and control the activities of a particular industry or government department. Often tasked with protecting consumer interests and ensuring legal compliance.
The consumer watchdog is investigating the bank's high fees.
The government established an independent watchdog to monitor the environmental impact of the new mining project.
Without a robust media watchdog to hold powerful figures accountable, the risk of systemic corruption and the erosion of public trust increases significantly.
From watch + dog.
Often used in the phrase 'watchdog group' or 'watchdog agency'.