Google News is utilising the Neo-Nazi National Vanguard as one of its news sources.
You can let them know what you think via their online complaints form.
Update: I complained to Google about this so I’m going to track their complaints procedure here.
The first response came within a few minutes and was clearly automated:
Thank you for bringing this to our attention. We’ll look into it. We’re
always working to improve Google News, and your feedback is very important
to us. We appreciate your support, and we hope you will contact us again
in the future with additional observations and suggestions.
The Google Team