From the longer Wikipedia page 
Southgate Road is a street in London, England, that runs from Baring Street in the south to the junction with Mildmay Park and Ball's Pond Road in the north.
The west side of Southgate Road is in the London Borough of Islington; and the east side is in the London Borough of Hackney. Southgate Road lies north of the Regent's Canal, west of De Beauvoir Town and east of Essex Road.
Joseph Stalin, Vladimir Lenin and Leon Trotsky visited Southgate Road for the 5th Congress of the Russian Social Democratic Labour Party in 1907, which was held at the Brotherhood Church which once stood on the corner of Southgate Road and Balmes Road.