Class action lawyers are generally interested in large classes, meaning many thousands of people -not 3.
Here you state that you were part of this business with 2 people, but you want to sue this "multilevel marketing" company. "Illegal business practices" usually inviolves some unfair competition or fraudulent practice like fraudulent ads or charging fees that aren't justified.
Take a look at CA Bus. I Prof, Code section 17200 linked below. The terms are deliberately vague because they're meant to be flexible in encompassing a wide range of activities.
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Having several plaintiffs does not make your complaint a class action. A business law litigator would be the person to consult. Reduce all your facts to writing, assemble all your documents that could be considered proof, determine everything you think may be dollar damages. You will get a much better reception from the attorneys you consult.
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I agree with previous lawyers. To answer your question whether there is Statute of Limitation, Statute of limitation for class action is no different of any claims of its nature. Therefore, whether your Statute of limitation has run depends on what nature your claim will be, whether it will be a class action or not.