They have been aggressively pursuing violators without prejudice. Sometimes some rather funny stories about this such as grandparents who don't use a computer are sued.
All the time, they wronged party is the poor artists who deserve their royalties (no argument here -- it is only fair).
Of course, though out the last few years, the recording industry is just as much trying to protect it's fiefdom as evidenced by this report.
The short form?
RIAA Petitions Judges to Lower Artist RoyaltiesAggressively litigious group has claimed to protect musicians in the past. Now believes musicians deserve less for "innovative" music distribution.