Isadore Less (1869 – January 26, 1935) was a German-American labor leader.

He was the original driving force behind the formation of the San Francisco Union Labor Party.

[1] At the time he was the Secretary of the local Journeymen Barber's Union, and was selected as the ULP's candidate for Auditor in the 1901 elections.

During the campaign, he misappropriated union funds, leading to his flight from the country and eventual arrest.

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