If they get extradited back to Poland, hopefully the stories aren't true and they won't be sentenced to death by circular firing squad.
Their M.O. was pretty basic, yet effective. Targeting mainly "big-box" electronic stores, they would enter an establishment as a (judging from the above photo, rather mopey-looking) group. Then, while a few of them would form a totally-not-suspicious human wall to obscure the view of cameras and staff, one of them would stash equipment (usually hard drives) under their coat and then saunter out the door. Then they'd head over to the next state to repeat the process. It's the kind of thing that happens countless times a day, but somehow, they were able to avoid getting caught for a good five years, filling up their swag Winnebago or whatever to the brim and hauling it back to their home base in Chicago to fence everything for cash. Once the authorities caught up with them in California, they claimed that they had committed all that pernicious purloining in order to pay off a $2 million debt (you can just chalk up that extra million to overzealousness, I guess).
However, should you be thinking that their little business paradigm was some sort of unique triumph in risk/reward effectiveness (minus the eventual incarceration, of course), get a load of the family who did essentially the same thing, but did it for twice as long and made more than double the profit.