Political satire in Italy: who sets the boundaries?

These are tough times for political satire in Italy. Comics get sued, politcal cartoonists get suspended from television shows, many satirists have disappeared from Italian television screens. Why? And what are the boundaries of acceptability for political satire, if any?

Riccardo Barenghi La Stampa
Luca Mastrantonio Il Riformista
Ranieri Polese
Corriere della Sera
Vincino Il Foglio