Their effectiveness has been questioned and United Nations peacekeepers in the Democratic Republic of Congo have been criticised for supporting an army accused of widespread rape and killings.
The World Cup football tournament kicks off in one week, and host South Africa is busy putting on the finishing touches. But not everyone is looking forward to the tournament. Authorites in cities including Cape Town are being accused of clearing the poor from the streets - to create a good impression for visiting fans. Al Jazeera's Haru Mutasa has more.