The Coalition for Responsible Sharing has released "Publishers and Societies Take Action against ResearchGate’s Copyright Infringements."
Here's an excerpt:
Numerous attempts to agree with ResearchGate on amicable solutions, including signing up to the Voluntary Principles of Article Sharing on Scholarly Collaboration Networks and implementing a user-friendly technical solution, remained unsuccessful. Members of the Coalition for Responsible Sharing are therefore now resorting to formal means to alter ResearchGate's damaging practices. The coalition members include the American Chemical Society, Brill, Elsevier, Wiley and Wolters Kluwer. These organizations will begin to issue takedown notices to ResearchGate requesting that infringing content be removed from the site. Concurrently, The American Chemical Society and Elsevier are asking the courts to clarify ResearchGate's copyright responsibility.