<< So a leftwinger is also known as a liberal and a radical. >>
BZZZZZZT!! I'm sorry, that's incorrect. Liberal and radical are two different things.
Main Entry: 2liberal
Function: noun
Date: 1820
: a person who is liberal: as a : one who is open-minded or not strict in the observance of orthodox, traditional, or established forms or ways b capitalized : a member or supporter of a liberal political party c : an advocate or adherent of liberalism especially in individual rights
You will particularly note the open-minded and individual rights bits....try 'em some time.
Fausto