Can the guy(s) who got fired pursue legal recourse? Could they sue her for defamation or something? They got their picture taken and posted without permission,

Can the guy(s) who got fired pursue legal recourse? Could they sue her for defamation or something? They got their picture taken and posted without permission, but I don't know if they can argue that they have a reasonable expectation for privacy at the conference. But what about losing their job and having their reputation tarnished? Maybe some legal types can weigh in.