"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 and socialist societies that pursue ideals of positive inter-personal relationships separate from capitalist mechanisms. However, later socialists such as the Marxists and the critics of socialism both disparaged utopian socialism as not being grounded in actual material conditions of existing society. Utopian socialist visions of ideal societies compete with revolutionary and social democratic movements.
Later socialists have applied the term utopian socialism to socialists who lived in the first quarter of the 19th century. They used the term as a pejorative in order to dismiss the ideas of the earlier thinkers as fanciful and unrealistic. Ethical socialism, a similar school of thought that emerged in the early 20th century, makes the case for socialism on moral grounds and is sometimes also disparaged.