Just before dawn on Sunday, gunmen slipped into the Montevideo home of Mónica Ferrero, Uruguay’s acting Prosecutor General. By day’s end, police had detained a man and a woman, recovered a burned getaway car, and were pursuing others. The president convened security and justice chiefs for an emergency meeting. That matters because detectives are probing whether the assault was meant to intimidate the justice system as it pursues organized-crime cases. If attackers can frighten justice officials, complex cases—from narco-finance to extraditions—become harder everywhere they intersect with Uruguay.