Martha Stewart, panicked by an anti-fur activist, cancels the signing of a book

EXCLUSIVE

Martha Stewart She abruptly canceled the signing of her book in New York after being interrupted by an anti-fur activist … and it is clear that the demonstration ruffled her feathers.

We just got a video of Martha's autograph session at Macy's, in Herald Square, NY, on Wednesday night, and it's crazy … you see the protester coming to blame. Martha, waving a sign about the killing of animals, said Canada Goose's "blood on their hands," while security guards were taking him away quickly.

Martha is clearly panicked by all this … we are told that the signature was canceled shortly after the incident.

Why did the activist target this event? As far as we know, Martha has no connection with Canada Goose.

By the way, tons of fans had come together to take a copy of his new book, "The Martha Manual: How to do (almost) everything!" It looks like they're coming home empty-handed.