Other forms: maximalists
A maximalist is someone who thinks things should be done in the biggest and boldest way possible. In politics, maximalists demand major changes, usually with the goal of ending capitalism.
Political maximalists believe in doing whatever is needed to obtain a goal. For Marxists, that means taking the necessary steps to achieve socialism — even a revolutionary overthrow of the current government. A less radical maximalist might endorse fighting for several major social changes immediately, without compromise. The term comes from this push to achieve the maximum amount of political objectives, rather than settling for the minimum. You can also use it to describe a busy, colorful, cluttered decorating style.