The Mayor of Prague described the protesters as professional trouble-makers and said their actions had angered the people of Prague.

BBC: News Online

Strasbourg's courts have handed out unusually severe sentences of up to two years' imprisonment to the few young trouble-makers unlucky enough to get caught (only a dozen arrests were made).

ECONOMIST: France: The kids’ revolt | The

They are not the only potential trouble-makers.

ECONOMIST: No peace for Brazil��s president

What helped the police do their job was that a number of known trouble-makers within loyalism were off the streets.

BBC: NI's relief at peaceful summer

The real divide is less, the challengers say, toadies versus trouble-makers, or loyalists against usual suspects.

BBC: What the '22 elections mean

Large teams of officers in full riot gear took control of parts of the City of London when they were met by a small number of trouble-makers.

BBC: Policing protest: Case studies of how forces perform