Propaganda:

New Latin, from 'Congregatio de propaganda fide Congregation
for propagating the faith', an organization established
by Pope Gregory. First appeared 1718

1) The spreading of ideas, information, or rumor for the purpose
   of helping or injuring an institution, a cause, or a person.

2) Ideas, facts, or allegations spread deliberately to further
   one's cause or to damage an opposing cause; also : a public
   action having such an effect.

-- pro*pa*gan*dist (noun or adjective)
-- pro*pa*gan*dis*tic (adjective)
-- pro*pa*gan*dis*ti*cal*ly (adverb)
-- pro*pa*gan*der (website)