1945 Stalin wakes up on the left side of the bed instead of the right. Greece, France and Italy are given "go" signals.
1945 US Government slows mobilisations for political effect and policing assistance with civil disorder and communist non-compliance in France and Italy.
1946 Rail & Coal strikes synchronise with sporadic European Mutinies. These are seen as "triumphal" and "democratic" amongst the majority of European servicemen.
1946 Sporadic PTO mutinies occur after ETO mutinies are tied to a rapid repatriation policy. These are comparatively successful.
1947 Further repatriation related strikes drive up wages, the Union movement resists decommunisation on a principled basis, and with greater support from leftwards moving post-mutiny veterans.
From there you can have your pick of "More like the UK" or "More like the Antipodes," but with a strengthening union movement willing to protect its left, and viewed as legitimate by ex-soldiers as associated with getting them repatriation, you've got a recipe for the Democrats realigning as the Party of Labor, and the Republicans realigning as the Party of Anti-Labor.
Not that this is going to remove race as an issue, but it will help make race a class issue, like in Ford plants in the late 1960s and early 1970s.
yours,
Sam R.