The Icarians were a French-based utopian socialist movement, established by the followers of politician, journalist, and author Étienne Cabet. In an attempt to put his economic and social theories into practice, Cabet led his followers to the United States of America in 1848, where the Icarians established a series of egalitarian communes in the states of Texas, Illinois, Iowa, Missouri, and California. The movement split several times due to factional disagreements.

Utopian socialism is the term often used to describe the first current of modern socialism and socialist thought as exemplified by the work of Henri de Saint-Simon, Charles Fourier, Étienne Cabet, and Robert Owen. Utopian socialism is often described as the presentation of visions and outlines for imaginary or futuristic ideal societies, with positive ideals being the main reason for moving society in such a direction. Later socialists and critics of utopian socialism viewed utopian socialism as not being grounded in actual material conditions of existing society. These visions of ideal societies competed with revolutionary and social democratic movements.