That does look like a legitimate class action lawsuit notification from a Lawfirm and usually these come from the Law firms who initiate class action lawsuits.
Having gotten many of these on products I bought or services I have used in the past, it does look legitimate.

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What difference does it make to the dead, the orphans and the homeless, whether the mad destruction is wrought under the name of totalitarianism or the holy name of liberty or democracy?