In history and politics, “radicals” were people or groups who wanted deep, fundamental change in society or government, not just small reforms.

Basic idea of radicals

  • The word comes from the Latin “radix,” meaning “root,” so radicals aim to change things “from the root” (for example, overturning a monarchy or a social order rather than just tweaking laws).
  • A political opinion is usually called radical when it goes far beyond the existing mainstream or demands a complete restructuring of the system.

Historical radicals in Europe

  • In 19th‑century Europe, “Radicals” were often democrats and republicans who pushed for universal suffrage, civil liberties, and limits on monarchy and church power.
  • In France, Radicalism developed into a movement and later the Radical Party, supporting secularism, free education, freedom of the press, and separation of church and state.

Radicalism in the United States

  • In the U.S., one early radical figure was Thomas Paine, whose pamphlet “Common Sense” called for American independence and challenged monarchy itself.
  • During and after the Civil War, “Radical Republicans” in Congress pushed hard to abolish slavery, punish Confederate leaders, and guarantee civil and voting rights for formerly enslaved people.

20th‑century radical leaders

  • In the 20th century, the label “radical” covered very different figures across the spectrum, from communist revolutionaries like Vladimir Lenin, Joseph Stalin, and Mao Zedong to theocratic revolutionaries like Ayatollah Khomeini.
  • The term is sometimes also applied (controversially) to leaders who aggressively tried to transform economic or political systems, such as Adolf Hitler on the extreme right, or economic neoliberals like Ronald Reagan and Margaret Thatcher, whose policies sharply broke with previous models.

How the term is used today

  • Today “radical” is not tied to one side; it can describe far‑left, far‑right, religious, or other movements that want sweeping structural change.
  • In everyday debate and online forums, people often use “radical” loosely, so it is important to clarify what standard or “center” they are comparing against.

In short, radicals were (and are) those who argue that fixing society means transforming its foundations—its institutions, power structures, and core rules—rather than adjusting the details.

Information gathered from public forums or data available on the internet and portrayed here.