There's a time-tested solution to this: one of the functions of these sorts of organisation could be to provide legal representation for their members. Unions, for instance, will often supply professional advocates (i.e. lawyers, negotiators etc.) to members in employee-employer or even professional-industry legal disputes.

It's often said on HN that skilled software developers are more akin to 'craftsmen' than they are to 'employees'. There's a number of good reasons why craftsmen have, almost invariably throughout history, formed guilds, unions or 'professional associations'...

You either organise or you accept being exploited.