Drumbeater
ahd-5
noun.
One that supports a cause, especially vehemently.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
One who
beats
a
drum
.
noun.
A
propagandist
.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a fervent and even militant proponent of something
Word Usage
"Crowther may have been his era's foremost drumbeater for foreign film."
Hypernym
Words that are more generic or abstract
advocate
advocator
exponent
proponent
Hyponym
Words that are more specific
bigot
doctrinaire
dogmatist