I suspect this supposed report on Trump was fabricated in order to discredit the media and left

[FarCenter]

50. So why is the author's identity not being revealed?

He is presumably a former British spy who worked in counterintelligence against Russia, probably MI-6 (but maybe MI-5, since it is counterintelligence). He was working for an American company that was retained to do opposition research on Trump.

In the intelligence world "former" is a squishy thing. He may also have been working for the UK when he did the report.

In June, the former Western intelligence officer—who spent almost two decades on Russian intelligence matters and who now works with a US firm that gathers information on Russia for corporate clients—was assigned the task of researching Trump's dealings in Russia and elsewhere, according to the former spy and his associates in this American firm. This was for an opposition research project originally financed by a Republican client critical of the celebrity mogul. (Before the former spy was retained, the project's financing switched to a client allied with Democrats.) "It started off as a fairly general inquiry," says the former spook, who asks not to be identified. But when he dug into Trump, he notes, he came across troubling information indicating connections between Trump and the Russian government. According to his sources, he says, "there was an established exchange of information between the Trump campaign and the Kremlin of mutual benefit."

http://www.motherjones.com/politics/2016/10/veteran-spy-gave-fbi-info-alleging-russian-operation-cultivate-donald-trump