To start a class action, you need to hire a class action attorney, which should be easy to find in California. However, in order to get their attention, then you need to be able to talk to them about the size of the damages. You need to be able to see if you can find out how many people use RMAH, how many people are playing Diablo, etc.
You also need to take a look at what the average transaction is over RMAH so you can talk about that to the attorneys.
The reason this is important is that a class action requires being able to identify potential members of the class who suffered a loss because of the actions by Blizzard Entertainment. You will also have to hire experts (likely in computer science and accounting) to make a prima facie
case on how the misdeeds of Blizzard Entertainment damaged the class. In short, starting a class action takes a lot of money. So you would need to be able to show the lawyers that are handling the case that there is potential for a lot of money to be made so that they will invest the time and their own money into the case to get it certified.
You are asking that I provide details into how to start a class action. However, this is an extremely complicated legal procedure which requires the expertise of a lawyer. It is the brain surgery of law. So, before I launch into an explanation of the basics of starting a class action, I caution you that this is not something you can do on your own.
Class certification is the starting point. This requires meeting the burdens of Federal Rule of Civil Procedure
(a) Prerequisites. One or more members of a class may sue or be sued as representative parties on behalf of all members only if:
(1) the class is so numerous that joinder of all members is impracticable;
(2) there are questions of law or fact common to the class;
(3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and
(4) the representative parties will fairly and adequately protect the interests of the class.
(b) Types of Class Actions. A class action may be maintained if Rule 23(a) is satisfied and if:
(1) prosecuting separate actions by or against individual class members would create a risk of:
(A) inconsistent or varying adjudications
with respect to individual class members that would establish incompatible standards of conduct for the party opposing the class; or
(B) adjudications with respect to individual class members that, as a practical matter, would be dispositive of the interests of the other members not parties to the individual adjudications or would substantially impair or impede their ability to protect their interests;
(2) the party opposing the class has acted or refused to act on grounds that apply generally to the class, so that final injunctive relief or corresponding declaratory relief is appropriate respecting the class as a whole; or
(3) the court finds that the questions of law or fact common to class members predominate over any questions affecting only individual members, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy. The matters pertinent to these findings include:
(A) the class members’ interests in individually controlling the prosecution or defense of separate actions;
(B) the extent and nature of any litigation
concerning the controversy already begun by or against class members;
(C) the desirability or undesirability of concentrating the litigation of the claims in the particular forum; and
(D) the likely difficulties in managing a class action.
If you can meet these requirements, then you can get a class certified in federal court
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Zachary D. Norris