Grand Guignol attack ads

In today's New York Times there is a discussion of recent TV ads that suggest that the
leading Democratic candidate Howard Dean is giving aid and comfort to
Osama bin Laden. The author says the ads are GG attack ads. So, GG attack ads are
those that induce fear and terror (as plays at the GG theater in Paris induced
fear and terror)?

It may refer to the deceased musician GG Alin.