Notes:

Intelligence services increasingly regard themselves as action-oriented, or as one former practitioner has put it, they are now 'hunters not gatherers' (Cogan 2004).
Cogan, Charles (2004), 'Hunters not gatherers: Intelligence in the twenty-first century', Intelligence and National Security. 19(2): 304-21.

Key partners are often the domestic security agencies of the global south rather than other foreign intelligence services (Lander 2004, Jones 2006).
Lander, Stephen (2004), 'International intelligence co-operation: An inside perspective', Cambridge Reviw of International Studies, 17(3): 481-93.
Jones, Garrett (2006), 'It's a cultural thing: Thoughts on a troubled CIA', Orbis, 50(1): 23-40.

Countries that appear to be barely on speaking terms are often the closest intelligence partners (Rees and Aldrich 2005). In recent years, the USA has worked with security agencies of both Libya and Sudan.
Rees, Wyn and Richard J. Aldrich (2005), 'Contending cultures of counterterrorism: Transatlantic divergence or convergence?' International Affairs, 81(5): 905-25.