The New Union Party (NUP) was founded in 1980 by defectors from the Socialist Labor Party (USA) (SLP). They claim that the SLP had become bureaucratic and authoritarian in its internal party structure.

This DeLeonist militant democratic socialist party "advocates political and social revolution" but denounces violence and is "committed to lawful activities to overthrow the capitalist economic system." The NUP fielded its first candidates in 1980, in Minnesota. The have an official newspaper called "The New Unionist."

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