Vandalism
Vandalism is "action involving deliberate destruction of or damage to public or private property".
The term also includes criminal damage such as graffiti and defacement directed towards any property without permission of the owner. The term finds its roots in an Enlightenment view that the Germanic Vandals were a uniquely destructive people.
The Real "Greenpeace"
Greenpeace Political Protest GM Violence Vandalism Graffiti Science
Sorry for getting overtly political, but I've been seeing Vomika's Greenpeace themed...