If you post fics over on AO3, you might want to look up your writing name here- http://www.ebooks-tree.com/ because these asshats are stealing peoples' fics and selling them for profit.
I found 3 of my stories there and filled out their Contacts form to ask them to remove them ASAP. I also made it clear that they did not have my permission to post my stories now or ever.
ETA: Found this post with more info on Tumblr. The poster gave the format you need for them to take your complaint serious:
My name is [name] and I am the author and owner of the following works:
- “Of Hunters and Wolves” by “Quicklikelight”
- “In the Woods” by “Quicklikelight”
- “This is a Gift” by “AnneinColor”
These are my intellectual property. I do not give you or anyone else permission to offer these works for download, and I did not consent for them to be available on your website. I am requesting that you remove them immediately. I can be reached by e-mail at [e-mail].
This information is accurate, and under penalty of perjury, I am authorized to act on my own behalf as the owner of this material.
Cut and paste that into their contact form and make sure that you make the subject line read: “DMCA Complaint” or they won’t process it.