The meetings held in London (1930–32) between Britain and Indian representatives to discuss Indian constitutional developments. The procedure was suggested by the viceroy, Lord Irwin, in 1929. Congress boycotted the first session (November 1930–January 1931), but, following the Gandhi–Irwin Pact (March 1931), Mahatma Gandhi attended the second session (September–December 1931). With the renewal of the non-cooperation campaign, Gandhi was imprisoned and Congress took no part in the final session (November–December 1932). The constitutional discussions formed the basis of the 1935 Government of India Act, with its plan for a federal organization involving the Indian Princely States.