From The Hill:

Under the law, the men could have faced a mandatory minimum sentence of five years, with it rising to seven years if the gun is brandished and to 10 if it’s fired. Other minimum sentences can also be imposed based on the type of firearm used during the alleged offense.

“In our constitutional order, a vague law is no law at all,” Gorsuch wrote. “Only the people’s elected representatives in Congress have the power to write new federal criminal laws. And when Congress exercises that power, it has to write statutes that given ordinary people fair warning about what the law demands of them.”