http://www.ncgunblog.com/2013/11/28/strange-deceitful-new-anti-gun-tactic/
Some anti puts gunbuster stickers on random businesses they visit. The author in TFA notes that it could be considered tortious interference since it could be shown to be preventing someone from doing business there who would have otherwise (as almost happened in this case). Hopefully this doesn't become widespread, but perhaps you should let business owners know before you decide to stop doing business with them, and why. They just might have not put the sign there....
Some anti puts gunbuster stickers on random businesses they visit. The author in TFA notes that it could be considered tortious interference since it could be shown to be preventing someone from doing business there who would have otherwise (as almost happened in this case). Hopefully this doesn't become widespread, but perhaps you should let business owners know before you decide to stop doing business with them, and why. They just might have not put the sign there....