Utopian socialism is a label used to define the first currents of modern 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, and in some cases, as reactionary. These visions of ideal societies competed with Marxist-inspired revolutionary social democratic movements.
The term is most often applied to those socialists who lived in the first quarter of the 19th century who were ascribed the label "utopian" by later socialists as a pejorative in order to imply naiveté and to dismiss their ideas as fanciful and unrealistic. A similar school of thought that emerged in the early 20th century is ethical socialism, which makes the case for socialism on moral grounds.
One key difference between utopian socialists and other socialists (including most anarchists) is that utopian socialists generally do not believe any form of class struggle or political revolution is necessary for socialism to emerge. Utopians believe that people of all classes can voluntarily adopt their plan for society if it is presented convincingly. They feel their form of cooperative socialism can be established among like-minded people within the existing society, and that their small communities can demonstrate the feasibility of their plan for society.