"Act of Justice"
Here Robespierres death is depicted as divine retribution, as in a classical myth. Numerous heads, presumably of those who had perished at the guillotine, watch two male figures (bearing a strong resemblance to Hercules, who had been an early symbol of the Revolution) carry the freshly severed heads of Robespierre and his followers toward the mythological river Styx, guarded by the threeheaded dog Cerberus.
Source: mfr 88.187