Why do Mazzini and Marx Support the Idea of Revolution?

Mazzini and Marx support the idea of revolution because when a society is no longer deemed fit by the people it should be subject to reform. Mazzini supports revolution because he feels the people which make up the majority of society have a right to reform their social and political systems. Marx's ideals are very similar to Mazzini's however Marx's idea is that revolution should be strictly used to transform the current society into a communist society.
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