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That's happened to my site more times than I like to remember. Google catches many of these on it's own. If you want to find lots more, search AllTheWeb.com.
There's a process. Send a spam report to Google, and also fax Google a DMCA notice of infringement. You can get their fax number at [google.com...] and the instructions for creating the notice are here: [google.com...] Of course, then you'll see your notice published at [chillingeffects.org...] shortly, so get yourself in a calm state of mind before writing the note.
Repeat the process for every other search engine that shows those results.
For those who are using redirects, you will probably have success by just sending a spam report to Google. You might also do a search for your company name and click on the link at the bottom of the page that says "Help us to improve" and report them there.
Google is deluged with spam reports. The squeaky wheel gets the grease.