Guy Fawkes was a papist traitor who along with his fellow papist terrorists tried to blow up parliament in 1605. However, they were so bad at it they warned someone who they knew would inform His Majesty. Naturally, the plot failed miserably and as a direct result, things got tougher for Catholics. So it is more like L is for Loser—instead Vendeta—who couldn't even avoid telling people that they wanted to blow up the Parliament.