direct action

Short definition from Wiktionary

Noun

1. 1
   A form of political activism in which participants act directly, ignoring established political procedures. It may take the form of strikes, workplace occupations, sabotage, sit-ins, squatting, revolutionary/guerrilla warfare, demonstrations, vandalism or graffiti.
2. 2
   Small-scale raids, ambushes, sabotage, etc. carried out by the military.