In politics the term left wing derives from the French Revolution,

In politics the term left wing derives from the French Revolution, as radical Montagnard and Jacobin deputies from the Third Estate generally sat to the left of the president's chair, a habit which began in the Estates General of 1789. Throughout the 19th century, the main line dividing Left and Right in France was between supporters of the Republic and those of the Monarchy.[3] The June Days Uprising during the Second Republic was an attempt by the left to assert itself after the 1848 Revolution, but few of the (still predominantly rural) population supported them.

After Napoleon III's 1851 coup and the subsequent establishment of the Second Empire, Marxism began to rival Radical Republicanism and the "Utopian socialism" of Auguste Comte and Charles Fourier. Particularly influential in this regard was the publication of the Communist Manifesto by Karl Marx and Friedrich Engels in 1848, which asserted that the history of all hitherto existing human society is the history of class struggle. They predicted that a proletarian revolution would eventually overthrow bourgeois society, and by abolishing private property create a classless, stateless, and post-monetary society.

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