Liberalism was originally about right-wing people that value liberty, economic freedom and individual freedom and individual rights. Later the term has been used by left-wing people and, as is today, a Liberal person is a left-wing person. The term has technically only changed in America, however, many other countries seem to also understand Liberalism as a left-wing ideology; it’s still a right-wing ideology in some countries though. Classical Liberalism, like Neoliberalism, is a right-wing ideology.
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You can have left-wing authoritarians as well as right-wing authoritarians. Therefore authoritarianism’s opposite, valuing liberty, economic freedom, individual freedom, and individual rights isn’t left-wing or right-wing either. The left and right can both value those things, just give different priorities to each aspect.