If you mean the European Union, it began life as a scheme of cooperation in mining and steel just after the war. Churchill was a prime mover, seeking to re-build France principally, as part of a European bulwark against America. But the Americans, rather than react against that supported the early union as a vehcile for restoring capitalism in Europe (and American markets) - conflict with the US came later. Being generally oriented towards the market it was wholly a pro-capitalist policy in Britain, and the left was intransigently opposed to it right up until about 1992. There was an underlying theme in the discussion that co-operation between the former 'Great Powers' of Europe was vital to avoid the conflicts of 1914 and 1939.
-- Jim heartfield