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What would happen in a case like this is that they would be capable of being sued in either CA or in a federal court in any state, based on them purposefully engaging in commerce in those states. The best way to handle a case like this is through a consumer protection attorney and giving the attorney the information on all of the individuals who have been scammed and what they will do is file one suit against the company with all of the plaintiffs and will seek to get it certified as a class action suit because of the number of plaintiffs.
Your alternative is to sue them in your state alone on the basis that they purposely sold products in your state and as such your state's court has jurisdiction over them for the matter and you can proceed on your own and if any other consumers want to join in your suit, then eventually it can be turned into a class action.
These are the two legal means of pursuing them outside of suing in CA with all of the plaintiffs together as a class action using an attorney in CA.
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