For months government officials have waged a campaign against Kaspersky Labs, a Moscow-based maker of popular antivirus software. Their distrust culminated last month in a Department of Homeland Security ban on federal networks using the company’s products.

Now we finally have some insight into why the U.S. has been giving one of Russia’s greatest business successes—a protector of more than 400 million people’s computers—the snub. According to a much-pored over report by the Wall Street Journal, an NSA hacker flouted protocol (and all common sense) two years ago by taking work home to a personal computer that ran Kaspersky software. The mistake would prove catastrophic.

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Why the US has knives out for Kaspersky