How do Revolutionary Socialists want to Achieve Socialist Goals? -How did this theory develop?

-They believe in Overthrow the Existing System and Replacing it with something Much Different -This occurred during the 19th Century, with mass Industrialisation and Excess Capitalism, Poor Working Conditions and more -It was very appealing when the Vote was also Completely Denied or given to the Bourgeois. Trade Unions were Illegal, Political Parties for the Working Class didn't Exist, and Workers had little rights