The Brady Campaign, in an effort to remain relevant in the gun control discussion, have started a flood of lawsuits attempting to litigate firearm and ammo dealers out of business or, at the very least, force them into accepting settlements designed to makes legal sales as difficult and uncomfortable as possible.
In PA, they're suing a shop for giving the federally required 4473 form to a straw purchaser (who passed federal background checks) and want dealers to interrogate firearm purchasers before a sale.
They're suing 'Lucky Gunner' ammo, an online dealer (go buy from them), for selling ammo to another individual who passed a federal background check and later went on to murder multiple individuals using ammo commonly available at your local WalMart. The only purpose for this is to cost them money in lawyers and try and get more restrictions for ammo sales.
There's nothing about 'safety' in any of this. The only purpose is to restrict firearms. This is 'gun control' in action.