Rubuta ci gaba don wannan sakin layi - A lokacin karni na 19 a Burtaniya, nahiyar Turai da Latin Amurka, kalmar "mai tsattsauran ra'ayi" ta zo ne don nuna ra'ayin 'yanci mai ci gaba wanda juyin juya halin Faransa ya yi wahayi zuwa. A tarihi, tsattsauran ra'ayi ya bayyana a farkon tsari tare da Juyin Juya Halin Faransa da kuma irin wannan motsi da ya yi wahayi zuwa gare shi a wasu ƙasashe. Ya zama sananne a cikin shekarun 1830 a Burtaniya tare da Chartists da Belgium tare da Juyin Juya Halin 1830
, sannan a duk faɗin Turai a cikin 1840s-1850s yayin Juyin Juya Halin 1848. Ya bambanta da zamantakewar zamantakewar siyasa na siyasa na yau da kullum, radicalism ya nemi goyon bayan siyasa don sake fasalin tsarin zabe don fadada kuri'a. Hakanan an haɗa shi da jamhuriya, kishin ƙasa na jama'a, kawar da taken, da hankali da juriya ga addinin jihar da aka kafa, sake rarraba dukiya da 'yancin' yan jarida.