http://agathe.gr/democracy/the_agora_and_pnyx.html
The Agora and Pnyx Center of public activity, the Agora was a large open square where all the citizens could assemble (2, 3). It was used for a variety of functions: markets, religious processions, athletic ... The meetings convened at dawn, and reluctant citizens were swept up from the Agora by slaves holding the ends of a long rope wet with red paint which would mark the clothes and thus make liable to a fine anyone who lingered or attempted to evade the call of duty. 5.