The Gun Owners' Action League (GOAL) of Massachusetts, where background checks are mandatory for all gun sales, says that the state's laws are far too strict, and the mandatory background checks have infringed upon the rights of law-abiding citizens.
"The laws have disarmed the people and made it so law-abiding citizens are guilty before proven innocent rather than the other way around," said GOAL President Jim Wallace.
Wallace added that the billboard's slogan, "criminals and terrorist welcome," is "ludicrous": "Why would a terrorist come to the United States to buy a gun?" he asked.
The Brady Campaign to Prevent Gun Violence said that terrorists have used gun shows to arm themselves. Ali Boumelhem was caught in 2000 buying guns allegedly for Hezbollah, which is on the U.S. State Department list of foreign terrorist organizations. Federal agents said they watched Boumelhem, a resident of Detroit and Beirut, travel to gun shows to buy gun parts and ammunition for shipment overseas. Boumelhem was convicted on a variety of weapons charges, plus conspiracy to ship assault weapons and other arms to Lebanon.
A Brady Campaign spokesman told ABC News, "People can say this billboard is over the top, but unfortunately, it happens to be true."