Why did Prohibition end?

While most accounts trace prohibition’s demise to widespread noncompliance and the graft it generated, we argue that elite congressional support for prohibition gave way when civil service reforms removed federal prohibition agents as patronage resources. We also argue that by giving states control of designing state conventions, and thereby risking state malapportionment of conventions, Democrats succeeded in overcoming the traditional fissures that divided their southern and northern wings.

That is from a new paper by Aaron J. Ley and Cornell W. Clayton.  Maybe I got this from somewhere on Twitter?