We have someone on the community team that handles these specifically. Note that, in most cases, the best we can hope for is that they come into compliance with our attribution guidelines.
That said, use the contact form to reach out and let us know, make sure that you include:
- The URL to the offending material, and if possible the URL to the original copy here
- Any search keywords that you used to turn this up
- Anything else you think is relevant
Even if you just pass us the link and let us know they're scraping, we'll investigate, but more detail (to the extent that you have time to provide it) is very much appreciated.
After you report it, try to forget about it, block them in your search results using whatever tools your search engine of choice provides - this should also send clear signal to the search indexes that the content isn't as relevant as they're trying to present (or, outright scraped).
The only motivation to do this is SEO webspam to drive ad impressions. Hence, complaining to your search engine and asking them to get the spam out of your results is also something you can do to help.
Thanks for wanting to help, it's the fact that our users are so heavily vested in the value of our content that we're able to stay above these evil web spammers. Well, most of the time, anyway.