The Christian Democratic Union (Dutch: Christelijk-Democratische Unie, CDU) was a minor progressive Protestant[1] party in the Netherlands during the interbellum.
The Synod of the reformed church therefore decreed disciplinary measures against members of the CDU.
After World War II, the party joined the newly founded Partij van de Arbeid.
The party's principles were based on the work of reformed theologian Karl Barth.
It was a left-wing party to the extent that it was opposed to war in any form and demanded radical redistribution of income, nationalisation of core industries and influence of workers on corporations.