Maina Kiai, the UN special rapporteur on the rights to freedom of peaceful assembly and of association, said he was "appalled" to hear about the blacklisting of union members in the UK construction industry.
Speaking on a trip to London, he said: "It is crucial that strong actions be taken against the making and using of such lists as a deterrence."
More top news
A calendar by photographer Steve McCurry captures the rare and disappearing food traditions of rural Africa.
After the Finnish company was acquired by Microsoft, all its phones will soon be rebranded as Microsoft Lumia devices.
After yesterday's fierce wind and rain things are starting to calm down, but it is still autumn so it remains fairly unsettled.