ORESTES: A terrible thing is the mob, whenever it has villains to lead it.
PYLADES: But with honest leaders its counsels are always honest.

[Ὀρέστης: δεινὸν οἱ πολλοί, κακούργους ὅταν ἔχωσι προστάτας.
Πυλάδης: ἀλλ᾽ ὅταν χρηστοὺς λάβωσι, χρηστὰ βουλεύουσ᾽ ἀεί.]

Euripides (485?-406? BC) Greek tragic dramatist

Orestes, ll. 772-773 [Orestes] (408 BC) [tr. Coleridge (1938)]
    (Source)

Original Greek. Alt. trans.:

ORESTES: Ah, my friend! When mobs have rotten leaders they are likely to do all sorts of nasty things.
PYLADES: It's a very different story when their leaders are wise, though ....
[tr. Theodoridis (2010)]

ORESTES: The mob is frightening when their leaders are criminal.
PYLADES: But when they have good one, their decisions are good.
[tr. Luschnig (2013)]

ORESTES:
The mob is nasty, when it has leaders
bent on doing wrong.
PYLADES:
          But when it’s controlled
by decent men, the decisions they make
are always good.
[tr. Johnston (2020), ll. 938-940]

The masses are terrible whenever they have scoundrels as leaders.
[tr. @sententiq (2020)]