Since becoming a vegan, Piraro has become a vocal activist for veganism.

Yet the political climate is such that the Bush team cannot simply ignore the arguments of the most vocal activists in the environmental movement.

McCrea is a vocal activist for various causes, notably global warming and world poverty.

A vocal activist for animal rights, Feldmann is a vegan.

The social and economic climate of the early twentieth century led to vocal activists for a two-year educational alternative to four-year higher education institutions.

He became one of the city's most vocal activists.

Consequently, Pentz became a vocal activist for nuclear disarmament, joining many significant peace marches of the 1970s and 1980s.

He spent his teenage years at a military boarding school in West Virginia; during the 1960s, he was a vocal anti-war activist.

She became a vocal activist in the areas of mathematics, computers, reading and writing education.