Kaspersky Lab makes antivirus software. It’s also based in Russia, and its founder used to work for Russian intelligence. Which is why, in 2017, Congress thought it was maybe a bad idea for the federal government to keep using Kaspersky software. D.C. Circuit: And that is A-OK. This is obviously about national security, not punishing Kaspersky. The law doesn’t run afoul of the rarely litigated “bill of attainder” clause of the Constitution, which prohibits Congress from passing laws to punish specific individuals.