From Longman Dictionary of Contemporary Englishradicalizerad‧i‧cal‧ize (also radicalise British English) /ˈrædɪkəlaɪz/ verb [transitive] to make people accept new and different ideas, especially ideas about complete social and political change→ See Verb table
Examples from the Corpus
radicalize• Young people have been radicalized by the struggle with the government.• To ensure his continued ascendancy over Congress, Gandhi had to radicalize himself again. 