Who was the laureate to refuse the Nobel Prize?

The French writer Jean-Paul Sartre refused the Nobel Prize for Literature in 1964, the only person ever to have done so. He explained that his personal belief was that writers should not accept awards which could prejudice their artistic freedom. Le Duc Tho also refused the Peace Prize in 1973 4 others were obliged to decline by their governments, including Boris Pasternak (Literature Prize 1958)