In 1998, under intensive Turkish pressure, Syria expelled Ocalan and shut down the PKK camps he had established there.

CNN: PKK's decades of violent struggle

Other companies, especially labour-intensive mining houses such as De Beers, will come under pressure from unions and possibly even from their own accountants to follow suit.

ECONOMIST: Anglo American offers AIDS drugs to all its employees

Leading European and US retailers have come under growing pressure to ensure that workers in their supply chain - particularly in labour-intensive markets such as India and China - are not exploited.

BBC: Primark fires child worker firms