You'd want to do this loudly enough that other dissidents hear and are afraid but not so loudly that other citizens get word and potentially join the dissidents

You'd want to do this loudly enough that other dissidents hear and are afraid but not so loudly that other citizens get word and potentially join the dissidents' side. You don't want a public lawsuit. You want Twitter to silently hand over the data and for the last tweet from the account to be "Got fired today :(".