Dr C P Blacker

Eugenicist Lord Ernest Simon of Wythenshaw (who became chairman of the BBC in 1947) was an ardent adherent of Sidney and Beatrice Webb, (core members of the Fabian Society).

His biography HERE is a 'must read' in respect of his links to his extensive Eugenics related activities:

"An important contributor to the PEP Report was Dr C P Blacker. Dr Blacker, a psychiatrist, had been General Secretary of theEugenics Society from 1930 to 1952, and was Honorary Secretary of the Population Investigation Committeeuntil his death in 1975 (Langford, 1988). It was the ‘intimate association formed by the late Lord Simon of Wythenshawe and Dr Blacker in producing the PEP report on World Population and Resources (PEP, 1955) which had led to the founding of the Simon Population Trust according to an early set of Trustees’ Minutes."

(from the biography linked above)