Federal agents are launching a new push in San Antonio to stop illegal gun purchases that can put firearms in the hands of criminals, gangs and drug cartels.

This week, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and the National Shooting Sports Foundation kicked off the 26th annual "Don't Lie for the Other Guy" campaign nationwide.

The effort targets straw purchases, which happen when someone purchases a gun for another person who cannot legally buy a firearm.