Synonyms:
radicalism
Meaning: the political orientation of those who favor revolutionary change in government and society
Usage examples
"It's odd," Amory said to Tom one night when they had grown more amicable on the subject, "that the people who violently disapprove of Burne's radicalism are distinctly the Pharisee class--I mean they're the best-educated men in college--the editors of the papers, like yourself and Ferrenby, the younger professors....