Radicals
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A political party
The term arose in England, in 1818, when the popular leaders, Hunt Cartwright, and others, sought to obtain a radical reform in the representative system of parliament Bol-ingbroke (Disc. Parties, Let. 18) employs the term in its present accepted sense: "Such a remedy might have wrought a radical cure of the evll that threatens our constitution," etc.
Wharton.