Here are Browder's exact words to the DCMS committee investigating Fake News, on 6 Mar 2018:
Q853 Christian Matheson: Mr Browder, a quick question, in the current context. Do you ever fear for your own personal safety?
Bill Browder: I do. The title of my book is “How I Became Putin’s No. 1 Enemy”. It’s sort of tongue-in-cheek, but at the same time it’s very real, in the sense that I have been threatened. I have been threatened on a number of occasions with death, including by Dmitry Medvedev, the Prime Minister of Russia, at the World Economic Forum in Davos. When a group of journalists asked him about Sergei Magnitsky, he said, “It’s a shame that Sergei Magnitsky is dead and Bill Browder is still alive and running around.” I have received kidnapping threats. That is on the unofficial side. On the official side, what the Russians would like to do with me more than anything would be to arrest me, get me back to Russia and then kill me within the control of their own system. So, as Ed mentioned, I have been the subject of six Russian Interpol red notices and the British Government have been approached 12 different times for mutual legal assistance from Russia, including my extradition. Russia has gone to a number of other countries: I was recently detained in Switzerland, based on a Russian information request at Geneva airport.
data.parliament.uk/writtenevidence/committeeevidence.svc/evidencedocument/digital-culture-media-and-sport-committee/fake-news/oral/79824.html