JK Rowling, Benedict Cumberbatch, Salman Rushdie and other world figures urge Putin to free Alexei Navalny
The signatories, which included actors Jude Law and Benedict Cumberbatch, and writers Margaret Atwood, JK Rowling and Salman Rushdie, said in a letter, 'He has been consistently returned to solitary confinement, (and) squeezed into a concrete cell the size of a dog kennel, with no ventilation'