Someone who supports extreme changes in a society is a liberal radical jacobin conservative

I believe your answer is going to be a radical. Please correct me if I'm wrong.

Someone who supports extreme changes in society is a Radical. This means that he believes that accepted traditional forms need to be be modified.  Radicals favor political and economic reforms and they have extreme principles. Radical thinking may generate new ideas, but sometimes their methods may be uncompromising.

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.