Earlier quoted context omitted.
Yes: http://www.cbsnews.com/news/daily-stormer-being-dumped-by-go... https://www.cnbc.com/2017/08/14/godaddy-boots-the-daily-stor...
Both of those are articles are about registrars refusing to do business with one specific hate group. They're not about registries.
ICANN has worked very well so far, but if they don't put up a strong response to registrar-based censorship on already-registered domains and make this contractually impossible, the internet is going to be in big trouble. We can't let "you can't have a domain because we don't want you to be able to talk, as a matter of corporate policy" become a thing.