From Ammoland:

“Universal” background checks are “universal” in name only and don’t stop criminals from stealing firearms, getting them on the black market, or getting them from straw purchasers. On April 8, ATF published a report on the agency’s firearm trafficking investigations. The “trafficking channel” for roughly two-thirds of the reported cases (65-percent) were “trafficking in firearms by a straw purchaser or straw purchasing ring,” “trafficking in firearms stolen from an FFL,” or “trafficking in firearms stolen from private persons.” For those unfamiliar with the term, “straw purchasing” is when a person buys a firearm, lying on ATF Form 4473 and undergoing a background check, on behalf of a person prohibited from possessing firearms.