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I'll admit that Swedish history is an area that I don't know that much about, beyond a few cursory Wikipedia searches, but I do know that they have a Social Democratic party that is both incredibly successful in government but also quite moderate. With a post-1945 PoD what could be done to push Sweden's political culture even further to the left?
A few suggestions based on my very limited knowledge of Swedish politics:
Keep/shift the Agrarian/Centre Party to the centre left. This would keep them as viable coalition partners and tacit supporters which could give the Social Democrats a much stronger parliamentary position and the confidence to push for more radical policies.
Strengthen the Communists who were typically coalition partners that shifted SDP governments to the left. Healing their various splits earlier could help as well as giving them a more active youth section to help capitalise on the youth radicalism during the 60s.