One is that they express the frustration of an underclass that feels increasingly marginalised.

ECONOMIST: Riots in England

His proposal for an underclass of immigrant workers, who would not participate in Social Security, is disappointingly lacking.

FORBES: Rubio Na?ve on Immigration

But he took to the idea of writing something of value to an underclass doomed to grow up illiterate.

ECONOMIST: Jon Stone | The

Unlike much of the Arab world, where Shia have traditionally constituted an underclass, the community in Pakistan began with a seat at the head table of power.

WSJ: Sadanand Dhume: The Plight of Pakistan's Shia

The Bishop of Chester, the Right Reverend Peter Forster, said that unsatisfactory remuneration could damage social cohesion, arguing that "the greater the inequality, the greater the chance of creating more of an underclass".

BBC: Minister: Concerns over executive pay 'justified'

Governments thus face a choice between banning the use of test results and destroying the industry, or allowing their use and creating an underclass of people who are either uninsurable or cannot afford to insure themselves.

ECONOMIST: Testing times | The

Whether the criminal "underclass" is an identifiable and stable group may be questionable, but BBC analysis of people charged in relation to the disorder in Manchester does suggest a clear correlation with deprivation.

BBC: England riots: The feast of fools?

Mr Meles is said to be pondering the idea of promoting private property rights, but the conventional wisdom among his officials is that, if peasants could sell their land, they would do so immediately, drink the proceeds and head for the cities, where they would become an unsightly and potentially disruptive underclass.

ECONOMIST: Ethiopia

Egypt was an autocracy with a tiny elite and a huge underclass.

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In an extreme version of this, the rich feel that they have become the new, vilified underclass.

NEWYORKER: Super-Rich Irony