Answer:

tyrants

Answer	Crossword Clue
TYRANTS	Hard heads
TYRANTS	Merciless bosses
TYRANTS	Ruthless leaders

TYRANTS	Absolute rulers
TYRANTS	Dictators
TYRANTS	They're absolutely powerful
TYRANTS	Nasty rulers
TYRANTS	Ruthless rulers
TYRANTS	Fire-breathers
TYRANTS	Oppressors.
TYRANTS	The Thirty ....

TYRANTS	Periander, Nero, etc.
TYRANTS	Overlords.
TYRANTS	Philip of Macedon and Periander of Corinth.
TYRANTS	Absolute rulers.
TYRANTS	Autocrats.
TYRANTS	Dictators.
TYRANTS	Relatives of taskmasters.
TYRANTS	There were thirty in Athens

TYRANTS	Oppressors
TYRANTS	British officials, to the colonists
TYRANTS	Caligula and Nero
TYRANTS	Despots
TYRANTS	Autocrats
TYRANTS	Tough bosses