Definition
In legal and political usage, "radicals" refers to members or adherents of a political movement or party advocating fundamental, root-level reform of governmental or representative institutions. As a legal dictionary term, it describes a historically specific political constituency — not a general designation for any extreme viewpoint — rooted in the early nineteenth-century English reform movement that sought structural transformation of parliamentary representation.
The term carries no technical legal meaning in modern law. It does not name a cause of action, a legal status, or a procedural concept. Its appearance in legal dictionaries reflects the older practice of including political and social vocabulary that lawyers and courts would encounter in documents, statutes, and proceedings of the era.
Common Language
Modern common usage (Wiktionary): Plural of radical — persons holding views that depart markedly from the mainstream, or advocates of sweeping change.
Historical common usage (Webster's 1913): One who advocates radical or extreme measures; a person who favors fundamental change in political institutions.
The gap between common and legal dictionary usage here is narrower than with most legal terms, but it runs in a specific direction: the legal dictionaries anchor "radicals" to a concrete historical party and a defined political moment (England, 1818), whereas both modern and historical common usage treat it as a floating descriptor applicable to any era or ideology. A researcher encountering the term in nineteenth-century legal or parliamentary materials should read it as a proper-noun reference to that specific movement, not as a generic pejorative or characterization.
Common Confusion
"Radicals" is sometimes read in historical legal texts as a neutral intensifier — meaning simply "those who favor major change" — when the context actually signals membership in or sympathy with the specific English Radical reform movement of the early-to-mid 1800s. Separately, the term should not be confused with its mathematical or chemical meanings, which have no legal application. In twentieth- and twenty-first-century legal materials, "radical" appears occasionally in First Amendment and national security contexts as descriptive political language, but it carries no technical legal weight in those settings either.
Why It Matters in Research
Researchers working in the Law Mind corpus should treat "radicals" as a historically bounded term. Its presence in Black's Law Dictionary — both editions — reflects a Victorian-era editorial convention of including political vocabulary that educated lawyers needed to interpret Parliamentary debates, treatises on constitutional reform, and English legal commentary of the period. The term will rarely appear as a operative legal word in American case law or statutes; when it does appear, it is almost always descriptive language in a political or historical context rather than a term of art.
The key navigational point: if you encounter "radicals" in a nineteenth-century English legal source, it signals engagement with Parliamentary reform debates — the movement for extension of the franchise, redistribution of rotten boroughs, and structural overhaul of representative government. Sources from this period using the term without explanation assumed reader familiarity with that specific movement. By the late nineteenth century, the word began to diffuse into more general usage, so dating the source matters for interpretation.
American legal materials of the same period may use "radicals" to refer to Radical Republicans during and after Reconstruction — a distinct political faction with a separate historical identity. Context will distinguish the two, but researchers should not assume the English Radical reform movement is the referent in American sources.
Historical Dictionary Support
Both editions of Black's Law Dictionary define "radicals" identically in substance: a political party originating in England in 1818, identified with leaders Hunt, Cartwright, and others, who sought radical reform of the parliamentary representative system. The second edition adds a quotation from Bolingbroke — "Such a remedy might have wrought a radical cure of the evil that threatens our constitution" — to illustrate the term's accepted sense, connecting the political use to its root meaning of fundamental or root-level change.
Both editions attribute the definition to Wharton, indicating reliance on Francis Wharton's law lexicon rather than independent drafting by Black. This is useful provenance: it places the definition within the tradition of English legal lexicography imported into American practice, and it explains why the entry reads as British political history rather than American legal doctrine.
Neither edition attempts to extend the definition to American usage or to acknowledge that the term had already acquired broader political currency by the time of publication. This is a notable gap: Black's treats "radicals" as a closed historical reference rather than as a living political descriptor, which means researchers should not rely on these entries for guidance on American nineteenth-century political usage of the term.
Jurisdictional Note
The definition as given in Black's is English in origin and application. American legal usage of "radicals" tracked different political movements — most significantly, Radical Republicanism in the 1860s–1870s — and the term carries different historical freight in American sources from that period.