They couldn't stop people from buying guns, stores from selling guns, or manufacturers from making guns. Now, they are going to the source... 

Via WSOCTV: 

Last Friday, 17-year-old Dimitrios Pagourtzis opened fire at Santa Fe High School in Santa Fe, Texas, killing 10 people. His weapons of choice were a Remington 870 short-barreled shotgun and a .38-caliber Rossi revolver, both stolen from his father, according to reports.

This latest tragedy brought Charlotte-based Bank of America Corp. under fire once again for its decision to back a lending package to save assault-rifle manufacturer Remington Outdoor Co. from bankruptcy, for which it officially filed in late March...

Following the Santa Fe shooting, gun-control advocacy group Guns Down America is circling BofA’s uptown headquarters in a truck with a billboard in tow. The billboard, expected to be around through Saturday, urges onlookers to “tell BoA to StopFundingGuns.org.”

Read more here.