It seems like the trailer is teasing this crackdown as well. In one scene, we see Aunt Lydia using a megaphone to talk to a bunch of handmaids who are at death's door. They're all set to be hanged as Aunt Lydia lectures them. It's possible she's giving them an ultimatum, and I would assume this is something that comes after the whole Janine situation is settled. If the handmaids continue to act out and push back, those in power will have to take extreme measures in order to maintain the status quo.
Seeing as the trailer also seems to show a funeral scene, here's my best guess: the handmaids plan some major act of resistance that really ruffles some feathers and pisses off some major higher-ups in Gilead. The leaders identify who was involved in the incident and execute them as an example. This is what happens if you don't obey. But this kind of decision could ultimately backfire. If the handmaids are pushed to their breaking point, who knows what hell will break loose?
