Pavlov was a Soviet spy.
Pavlov lived at 77 Marlborough between 1942-1945 in a house whose exterior is little changed from the 1940s. Officially Second Secretary at the Soviet Embassy nearby, Pavlov was in fact a representative of the NKGB (the State’s Commissariat for State Security), running his own spy ring. He was only 28 years old when he was appointed.
Three months before taking his Ottawa post, Pavlov had articulated the Soviet espionage goals in the United States: “We are interested in the plans developed by the government for conducting foreign and domestic policy of the country; [in] all the accompanying machinations, backstage negotiations, intrigues – [in] everything that is done before one or another government decision becomes public knowledge.” One can presume that the same goals informed his activities in Canada.
The Canadian government declared him a “persona non grata” in 1946 after Igor Gouzenko, the cypher clerk at the Soviet embassy, defected and revealed the existence of vast Soviet espionage operations in the West and he returned to Moscow. Pavlov went on to a distinguished career in the Soviet intelligence services, achieving the rank of Lieutenant General by the time he retired in 1990.
http://documentstalk.com/wp/pavlov-vitaly-grigorievich-1914-2005/