According to media reports, at least 60 Russian officials implicated in the controversial death of Russian lawyer Sergei Magnitsky have been secretly banned from entering the UK by the British government. Magnitsky was working for Hermitage Capital Management, a British-based investment fund, when he exposed a tax fraud allegedly committed by police officials and worth some $200 mln (perhaps being the biggest in Russian history). After making accusations against Interior Ministry officials, Magnitsky was arrested and then died in police custody after being denied medical care. The UK visa ban, which has not been publicised for fear of doing damage to Anglo-Russian relations, follows the lead of the US, which introduced visa bans for individuals accused of involvement.
UPDATE: UK denies existence of secret visa bans