Radical politics denotes the intent to transform or replace the  principles of a society or political system, often through social change, structural change, revolution or radical reform. The process of adopting radical views is termed radicalisation.

The word  derives from the Latin  ("root") and Late Latin  ("of or pertaining to the root, radical"). Historically, political use of the term referred exclusively to a form of progressive electoral reformism, known as Radicalism, that had developed in Europe during the 18th and 19th centuries. However, the denotation has changed since its 18th century coinage to comprehend the entire political spectrum, though retaining the connotation of "change at the root".

History 
The Oxford English Dictionary traces usage of 'radical' in a political context to 1783. The Encyclopædia Britannica records the first political usage of 'radical' as ascribed to Charles James Fox, a British Whig Party parliamentarian who in 1797 proposed a 'radical reform' of the electoral system to provide universal manhood suffrage, thereby idiomatically establishing the term 'Radicals' as a label denoting supporters of the reformation of British Parliament.

Throughout the 19th century, the concept of radical politics broadened into a variety of political notions and doctrines. Party politics in England began to favour moderate positions, marginalising other movements into more politically aggressive factions. As open advocacy of republicanism was illegal in France following the Napoleonic Wars, Radicals emerged under similar reformist ideals as their British counterparts, though they later branched out to form the Radical-Socialist movement with a focus on proletarian solidarity. With the rise of Marxism, the notion of radical politics shifted away from reformism and became more associated with revolutionary politics. In United States politics, the term is used pejoratively among conservatives and moderates to denote political extremism, with the 19th-century Cyclopaedia of Political Science describing it as "characterized less by its principles than by the manner of their application".

During the 20th century, radical politicians took power in many countries across the world. Such radical leaders included Vladimir Lenin and Joseph Stalin in Russia, Mao Zedong in China, Adolf Hitler in Germany, as well as more mainstream radicals such as Ronald Reagan in the United States and Margaret Thatcher in the United Kingdom.

Positions

Status quo change 
The common feature to all radical political forms is a view that some fundamental change is required of the status quo. For an array of anti-capitalist forms, this manifests in anti-establishment reactions to modern neoliberal regimes.

Concept of ideology 
The Stanford Encyclopedia of Philosophy describes the radical concept of ideology to be that:
 While social conditions exist "that are vulnerable to criticism and protest; ideology exists to protect these social conditions from attack by those who are disadvantaged by them."
 "Ideology conserves by camouflaging flawed social conditions, giving an illusory account of their rationale or function, in order to legitimate and win acceptance of them."

This view reflects "a consensus among radicals of all stripes on the role of law as a  force to safeguard the unjust relations of the status quo." This radical critique of ideology is especially prominent within post-leftism. In addressing specific issues, some radical politics may completely forgo any overarching ideological plan.

Difference from extremism 
Astrid Bötticher identifies several differences between radicalism and extremism, among them in goals (idealistic vs. restorative, emancipatory vs. anti-democratic), morals (particular vs. universal), approach towards diversity (acceptance vs. disdain), and use of violence (pragmatic and selective vs. legitimate and acceptable).

See also 

 Anarchism
 Communism
 Populism
 Radical centrism
 Radical feminism
 Radical left (disambiguation)
 Radical right (disambiguation)
 Reactionary
 Revolutionary
 Rules for Radicals

References

External links 
 The M and S Collection at the Library of Congress contains materials on radical movements.

Political spectrum
Political terminology