It has been suggested at this website that research scientists have an “agenda” in that they depend on Government grants to stay in business.
I don’t have to mention names, but we all know of someone who scoffs at scientific studies on global warming for the above mentioned reason.
I now present you with a formidable array of instances of government interference with, including suppression or distortion of, scientific work.
http://www.ucsusa.org/scientific_integrity/interference/a-to-z-guide-to-political.html