While Marxism had a significant impact on socialist thought, pre-Marxist thinkers (before Marx wrote on the subject) have advocated socialism in forms both similar and in stark contrast to Karl Marx and Friedrich Engels' conception of socialism, advocating some form of collective ownership over large-scale production, worker-management within the workplace, or in some cases a form of planned economy.
Early socialist and proto-socialist philosophers and political theorists: Ricardian socialist economists: Utopian socialist thinkers: