This week, Saks Fifth Avenue, Saks Off 5th, and Lord & Taylor department stores—all owned by The Hudson’s Bay Company—acknowledged a data breach impacting more than five million credit and debit card numbers. The culprits? The same group that's spent the last few years pulling off data heists from Omni Hotels & Resorts, Trump Hotels, Jason’s Deli, Whole Foods, Chipotle: A mysterious group known as Fin7.

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