Politicization can be described as the shading of analysis to fit prevailing policy or politics.
Politicization of Intelligence occurs when intelligence analysis is skewed, either deliberately or inadvertently, to give policymakers the results they desire. There are generally three most well-documented ways in which finished intelligence can be corrupted:
(From James J. Drylie's Intelligence document, www.kean.edu)
Betts, R. K. (2004, May 2). Intelligence looks broke, but does it need fixing? The Baltimore Sun. Link to source
Betts, R. K. (2011, May 2). The "Politicization" problem. The New York Times. Link to source
Eddington, P. G. (2015, August 31). Politicization of intelligence: Lessons from a long, dishonorable history. Just Security. Link to source
Goodman, M. A. (2008, March). The CIA and the perils of politicization. Center for International Policy. Link to source
Hayden, M. (2015, September 24). Politicization of intelligence on Islamic State fight. Washington Times. Link to source
Jervis, R. (2013, April 24). Iran: How intelligence and policy intersect (WP 257). Rajaratnam School of International Studies. Link to source
Moretti, R. (2016). The psychological puzzle: Contributing factors to the top-down politicization of intelligence. Elements, 12(1). Link to source
Rovner, J. R. (2008). Intelligence-policy relations and the problem of politicization (Doctoral thesis, Massachusetts Institute of Technology). MIT Libraries. Link to source
Schake, K. (2013, April 25). The Obama administration’s troubling history of politicizing intelligence. Foreign Policy. Link to source
Stephens, B. A. (2010). A hedge against politicization: An impartial intelligence community for America (Master's thesis, U.S. Army War College). Defense Technical Information Center. Link to source
Tomes, R. (2015, September 29). On the politicization of intelligence. War on the Rocks. Link to source