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In page Robert Nozick:

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At one point, Nozick joined the Young People's Socialist League, and at Columbia University he founded the local chapter of the Student League for Industrial Democracy. He began to move away from socialist ideals when exposed to Friedrich Hayek's The Constitution of Liberty, claiming he "was pulled into libertarianism reluctantly" when he found himself unable to form satisfactory responses to libertarian arguments.[2] Nozick was initiated into the Alpha-Tau chapter of the Kappa Sigma fraternity while at Columbia in 1956.[citation needed]