The Passfield Memorandum of 1930, officially the Memorandum on Native Policy in East Africa, was a memorandum circulated by Sidney Webb, 1st Baron Passfield, who was Secretary of State for the Colonies under Ramsay Macdonald in the second Labour government, to colonial governors in the British Empire.
The memorandum "introduced a new era in colonial labour policy. Trade unions were to be encouraged, even though subject to registration".
References
Passfield Memorandum Wikipedia(Text) CC BY-SA