Gelderloos first became involved in political issues as a high school student, and described the
Seattle WTO protests in November 1999 as helping influence his political development. In November 2001, Gelderloos was arrested with 30 others for trespass in protest of the American military training facility
School of the Americas, which trains Latin American military and police. He
represented himself in court and was sentenced to six months in prison. Gelderloos previously organized a student rally against the
Iraq War and was a member of a
copwatch program in
Harrisonburg. In April 2007, Gelderloos was arrested in
Spain and charged with
disorderly conduct and illegal demonstration during a
squatters' protest. He faced up to six years in prison. According to Gelderloos, he was arrested as a bystander after someone had set off a firework designed to scatter fliers through the air. He claimed that he was
unfairly targeted for his political beliefs. He was acquitted in 2009. He is known for his 2005 book,
How Nonviolence Protects the State, which has been cited in works discussing and analyzing forms of violent and
nonviolent resistance. He has written for the publications
In These Times and
ROAR Magazine. In a review of his 2017 work
Worshiping Power: An Anarchist View of Early State Formation, William Gillis described him as "an anarchist committed to making anarchist theory accessible" and "within our movement [...] probably the least controversial anarchist writer alive". In 2024, he co-produced
It’s Revolution or Death, a documentary series focused on the global
climate crisis, in collaboration with media collective subMedia.Tv. == Works ==