So, there's these Russians, right? And they had this ... defrauding the government thing. They'd sell medical equipment to the government at ridiculously inflated prices -- home whirlpools that cost about $30 were listed as costing $380 -- and they'd pocket the difference between the real cost and the fake cost, split it amongst co-conspirators, etc.
Hilariously, Vadim Yuzovitskiy and Grigory Groysman had been here before. They ran the same scam previously, Yuzovitskiy got caught, snitched on Groysman, and he snitched on everybody else. They testified that immediately after the case was closed, they opened a new office and went back to business as usual. When the sequel was inevitably discovered, the FBI went with their usual snitches and prosecuted the defendant, Lyubov Groysman, a woman who argues that she was simply a clerk, unaware of any scam or illegal activity.
Legally, that's all we know right now, because her conviction for being one of the main participants was just reversed for obvious, plain, ridiculous error. And the Second Circuit, mindful that not all cases will be this easy in the future, sent a little warning to prosecutors in the circuit.