Reminds me of an incident that occurred in the City back in the mid 90s shortly after I arrived.
The anti-capitalism unwashed decided as a protest to invade the futures exchange, which at the time was non-electronic and consisted largely of a bunch of loud, larry Essex or East End lads who liked to have a few and kick off in the bars around the exchange after work. Hardly the most educated, civilised lot, to say the least.
It didn't end so well for the hippies