 Lady Simon was most concerned about less conspicuous forms of servitude, including indentured labour, peonage, and debt bondage.Deeming it incompatible with the principles of trusteeship under the League of Nations, she confronted and denounced the British colonial policy of extorting forced labour from Africans in east Africa.For several decades, she fought for the emancipation of Mui Tsai, domestic enslaved girls, along with Edith Picton-Turbervill MP and Eleanor Rathbone MP.