Grub Street = "Hack Writers". Don't Take My Word for it. Check Wikipedia.
How does Wikipedia know everything? Scary. Check out its entry about Grub Street.
P.S. Editor denies any plagiarism perpetrated by Hadley "the Hack" Tomicki. No reason. No explanation. Just denial. Editor simply doesn't believe this was plagiarism. Nothing to see here. Move along.
I guess we'll all have to just take her word for it. Or not.