Collecting societies' mandates

Bruce Springsteen reportedly wants his name removed from a claim brought against a bar where unnamed musicians are said to have performed two of his songs. The trouble is, though, that as far as I can see from a quick look at the current Membership Agreement (downloadable from here), ASCAP has the right to take enforcement action in the names of its members (clause 4). He might have signed a very different document, of course, as I imagine it's some years since he joined ... but I don't expect there was that much difference.