Aristotle did not have a front-row seat at the brief (404-403 BC) rule of the Thirty Tyrants in Athens following the Peloponnesian War - he’d be born 20 years later - but knew very well many of the participants, the survivors, at least. Chief among the Tyrants was Critias, an ex-student of Socrates, who openly mocked Critias and refused to obey his order to arrest a mutual acquaintance. In 8 months of rule the Tyrants managed to murder 5% of Athens’ entire population. Interesting times.
I can't say they invented lawfare because there are earlier examples (Naboth was a victim of lawfare practiced by Jezebel: see I Kings 21).