Which court hears the cases of people convicted under laws that were previously ruled unconstitutional?

the district court
the juvenile court
the supreme court
the parish court

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.