vocal critic

Translations
громкий критик
He has been a vocal critic of the new policy.
Он был громким критиком новой политики.
Definitions
A vocal critic is an individual who openly expresses their opinions, often in a loud or assertive manner, about a particular subject, person, or work, typically highlighting perceived flaws or shortcomings.
Words
vocal

adjective
открыто выражающий своё мнение
critic

noun
критик