Radicalism

Type: Concept

As of November 2026, Radicalism has been mentioned in one podcast episode on The Ezra Klein Show (Dec 2025).

Radicalism was a political movement representing the leftward flank of liberalism between the late 18th and early 20th century. Certain aspects of the movement were precursors to a wide variety of modern-day movements, ranging from laissez-faire to social liberalism, social democracy, civil libertarianism, and modern progressivism. This ideology is commonly referred to as "radicalism" but is sometimes referred to as radical liberalism, or classical radicalism, to distinguish it from radical poli