Members and supporters of the hacktivist collective Anonymous march in downtown Washington DC.

Hundreds of protests around the world sparked up on Tuesday in what the hacking collective Anonymous called the "Million Mask March." Donning Guy Fawkes masks, on the day that marks the anniversary of the 1605 Gunpowder Plot that failed to blow up the English Parliament.

"Million Mask Marches" were planned for 450 cities, through which people in Guy Fawkes masks took to the streets, in protest of many causes, "from corruption to fracking." Russell Brand attended the London rally: "Whatever party they claim to represent in the day, at night they show their true colours and all go to the same party."

Protesters in Washington, D.C., made their way to Pennsylvania Avenue chanting, "Obama. Come out. We've got some sh*t to talk about," among other things.

The Washington Post reports one arrest on a charge of assault on a police officer in Lafayette Square. The Capitol Police also confirmed that they affected two arrests for crossing a police line at the West side of the Capitol later in the day.

In Chicago, police and protesters exchanged hugs. While in Denver, a handful of arrests were made after it was reported that a building was being vandalized, according to the Denver Post.

On Facebook, the official event description reads: “Remember who your enemies are: Billionaires who own banks and corporations who corrupt politicians who enslave the people in injustice.”

The real Guy Fawkes was arrested on Nov. 5, 1605, after British authorities tipped off by an anonymous letter found him guarding explosives meant to blow up the House of Lords and assassinate King James.