From Streets with a Story: "The former Brotherhood Church was originally Southgate Road Chapel, De Beauvoir Town (architect: J. Tarring) 1862, which up to 1935 was at the corner of Balmes Road. This was where the Fifth Congress of Russian Social Democratic Party took place ...The Minister from 1902-7 was the Revd A. Baker who was sympathetic to the pacifist movement. 'Texryte House', commercial premises, were built on the site."
From British History Online: "Southgate Road chapel. Ind. chapel adjoining sch. at N. corner of Balmes Rd. reg. 1860-9. Reg. as Brotherhood ch., on same site, 1897. .... Closed between 1935 and 1938."
This 1915 map shows "Congregational Church" on the site with a "Sunday School" behind. This 1938 map shows the church and school still there.
Past Tense and the Islington Gazette both give the history of the Brotherhood Church at some length.
Alamy has some action shots from 1917 of "Wild scenes ... at the Brotherhood Church...". Comparing the building in those photos with this photo from Past Tense rather confirms our thoughts that the political meetings would have taken place in the Sunday School hall behind the church, and not in the church itself.
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