A source of forged documents or material whose authenticity is open to doubt. The problem posed by such documentation is that while the actual product may have been fabricated, the content may still reflect an essential truth. A good example is the Zinoviev Letter, now widely regarded as having been manufactured by a notorious White Russian forger and peddled to the Secret Intelligence Service head of station in Riga in 1924, which accurately reflected the policy of the Comintern and the views of the alleged author, Grigori Zinoviev, even if the actual text was bogus.