The phrase "aggressive proponent" is correct and usable in written English.
It can be used to describe someone who strongly advocates for a particular cause or idea in a forceful or intense manner.
Example: "As an aggressive proponent of renewable energy, she tirelessly campaigns for policy changes to support sustainable practices."
Alternatives: "strong advocate" or "fervent supporter".
Preston Padden, the lead lobbyist for the Walt Disney Company, who acted as the media industry's most aggressive proponent of regulatory restrictions, spoke uncharacteristically kindly of America Online and Time Warner.
Macierewicz is probably best known in Poland as the most aggressive proponent of the claim that the 2010 Smolensk air disaster in western Russia plane crash that killed the country's then president, Lech Kaczyński, and scores of senior Polish officials, was a Russian plot in collusion with PiS's domestic political opponents.
The consumer electronics juggernaut is probably the most aggressive proponent of this technology — of the company's six desktops, five come with DVD burners.
The strategy's most aggressive proponent was Democratic Senator Mark Udall of Colorado, who made his support for women's reproductive rights a centrepiece of his campaign.
General Hayden is an active commentator on the defense and intelligence scene, and recently suggested that he favored Apple's stance in its dispute with the FBI, which took many by surprise given his former roles as an aggressive proponent of surveillance measures to combat terrorism.
The architect of these programs is Teikyo University President Shoichi Okinaga, an aggressive proponent of kokusai, the movement for internationalizing the Japanese higher-educational system, begun about 15 year ago.
Nissan and Renault are by far the most aggressive proponents among major automakers of electric vehicle technology.
She will also meet Danny Danon of World Likud, one of Israel's most aggressive proponents of expanding the settlements.
Luis Medina, a charismatic and outspoken child welfare administrator who had grown up poor in the city, became one of the most aggressive proponents of the new philosophy.
Outstanding Confucian scholars of conservative bent argued vigorously with aggressive proponents of new concepts of man, of knowledge, and of the universe.
The two movements would have disagreed about nearly everything, but each had aggressive proponents who, backed up by powerful social forces, established their views as the conventional wisdom of an era.
