click is a new season of coverage on TV, radio and online, examining the global differences that divide us.
Over the next few months the BBC will be exploring eight key themes that illustrate the contrasts in our extreme world.
Corruption is a problem that exists all over the world.
In some countries it persists in all forms in everyday life from top to bottom and in others it is only in certain sections and hidden from the general population but very few places, if any, are totally free from it.
Big city politics in America is rarely for the faint-hearted, but few places have such a reputation for bare-knuckle self interest and outright venality as Chicago.
For more than a century, the city's wheels have been oiled by patronage, bribery, and graft.
In this documentary, local journalist Steve Edwards takes to the mean streets of his hometown - meeting the political bosses behind the so-called "machine" that has controlled democracy for so long, and asking why the Windy City is such a hotbed of corruption.
First broadcast 8 December 2010
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