From Guns.com:

The measure, sponsored by Reps. Diane Black (R-TN) and Ted Poe (R-Texas), would place a prohibition on the Federal government’s current practice to require race or ethnicity to be disclosed during the transfer of a firearm. This comes after an article in the Washington Times earlier this week brought attention to the practice, quietly implemented two years ago by the ATF, of mandating that patrons buying or receiving a gun select a series of questions on Form 4473 to better identify their race and whether or not they are Hispanic.