Terrorism Before 9/11
An excerpt from the new book '9/11 The Unfinished Battle' by Phil Gurski

TL;DR
- Modern terrorism has evolved through four historical waves: anarchist, anti-colonialist, new left, and religious.
- The anarchist wave involved assassinations of heads of state.
- The anti-colonial wave included movements in Ireland, Kenya, Algeria, and Palestine.
- The new left wave featured Western groups engaging in kidnappings, hostage-taking, assassinations, and bombings.
- The religious wave is predominantly associated with jihadist groups, with Islam at its core.