vocal advocate

Translations
громкий защитник
He is a vocal advocate for human rights.
Он является громким защитником прав человека.
Definitions
A vocal advocate is a person who actively and openly supports or promotes a particular cause, idea, or policy, often expressing their opinions and arguments in a clear and assertive manner.
Words
vocal

adjective
открыто выступающий
advocate

noun
защитник