Channel 4 news presenter Jon Snow announced at a recent ‘Leave’ rally that he had never seen so many white people in one place. But political action is above race, colour or creed, and different interest groups are essential to democracy. So what was it about all these citizens? Too ‘unrepresentative’? Too ill-educated? Too (oh horrors) poor? Snow would have been aghast at what the consequences of such a dreadful mob were in Athens of the 5th-4th c bc.