Where there trials regarding collaboration postwar?

[Felix C]

I am referring to what would have been German occupied Belgium and France. Any persecutions postwar for working with or being friendly with the enemy? Prostitutes come to mind. Purveyors, farmers, etc. Even civil servants. 

[AOK4]

Yes, there have been, although not that many. The most famous example was August Borms in Belgium, who then even got elected to the Belgian parliament while in jail in 1928. He got a second time convicted for collaboration after WW2 and executed.