What are some classic dystopian tropes in dystopian fiction?

A classic trope in dystopian fiction would be constant surveillance for government control. This is evident in the likes of George Orwell's '1984', (1948) where 'Telescreens' are used to monitor the population in their every move. These two-way screens are situated in the houses of everyone in Airstrip 1, as well as out in public. Hidden microphones are in the countryside. Helicopters snoop in people's rooms. As a result of this constant surveillance the population is on continual alert for the 'ThoughtPolice', and the government can control their actions and supposedly their thoughts in a heightened sense of paranoia. This is classic across dystopias where governments optimise technology for their own benefit.Another classic trope of dystopian fiction is the use of violence and terror to subdue the population. In Margaret Atwood's 'The Handmaid's Tale' (1985), the Handmaids have to attend 'Salvagings', or executions. By the state showing them what happens to anyone who disobeys them, the Handmaids seek to conform and obey in Gilead. This is classic in dystopias with violence a common theme of everyday life.