No, only the owner of rights can institute legal action for infringement of those rights (see 17 U.S.C. ยง 501(b)). Other parties may be involved in the action, but only the owner of infringed rights is allowed to file the complaint.
The DMCA, however, does allow authorized agents (and under penalty of law they must indeed be authorized) to issue takedown notices for specific cases of infringement on a network service. Beyond that though, such agents are just about powerless.
Re: You?
The DMCA, however, does allow authorized agents (and under penalty of law they must indeed be authorized) to issue takedown notices for specific cases of infringement on a network service. Beyond that though, such agents are just about powerless.