This is a fascinating look at one of the 20th century’s most infamous spies.

“Dear Comrades.”

With those two words spoken in an impeccable upper-class English accent, one of Britain’s most famous spies and its greatest traitor begins a masterclass in betrayal to a select audience of East German spies.

Philby’s hour-long address was preserved on video tape and never seen in public until now.

The BBC unearthed it in the official archives of the Stasi in Berlin.

And here’s a look into the committed communist mind.

“It was a very dirty story – but after all our work does imply getting dirty hands from time to time but we do it for a cause that is not dirty in any way,” Philby explains.

“I have to admit that was the most blatant intrigue against a man I rather liked and I admired but the instructions stood and nothing I could do would alter them.”