/ˈrædɪkəlz/
NOUN
A person with radical opinions, especially one who advocates fundamental changes in social or political institutions.
People who support significant changes to existing political or social systems, including progressive reform and revolutionary movements.
People who promote extreme political positions, rebellion, or opposition to established authority, sometimes through disruptive or revolutionary action.
NOUN
A member of a historical political movement, including a progressive wing of the British Liberal Party or a French political party advocating moderate social reform, republican government, and secular politics.
Members of the most progressive wing of the 19th-century British Liberal Party who supported social reform, generally stopping short of socialism.