David Clive Jenkins (2 May 1926 – 22 September 1999) was a British trade union leader. "Organising the middle classes", his stated recreation in Who's Who, sums up both his sense of humour and his achievements in the British trade union movement.
He was born in Port Talbot, Glamorgan, Wales. His father was a railway worker. On leaving Port Talbot County Boys' School in 1940 at the age of 14, when his father died, he started work in the laboratory at a metalworks and continued his education by taking evening classes at Swansea Technical College. Three years later, he was in charge of the lab. Two years after that, he was a night shift foreman.
Jenkins had early involvement in his trade union the Association of Scientific Workers (AScW) and become a lay official in 1944, when he was elected as secretary of his branch. In 1946, at the age of 20, he left Port Talbot to become a full-time official at the Birmingham office of the Association of Supervisory Staff, Executives and Technicians (ASSET), where he was appointed assistant divisional secretary. He was at that time a member of the Communist Party of Great Britain.
In 1951, he organised his first major national dispute, a strike at Heathrow Airport that caused British European Airways to cancel more than 800 flights.
Moving almost immediately to the head office, he received rapid promotion, as national officer in 1954, deputy general secretary in 1957 and general secretary in 1961.
Then, ASSET had 23,000 members, which later increased to 50,000 by 1969, when ASSET merged with AScW, to form ASTMS (the Association of Scientific, Technical and Managerial Staffs). ASSET snd Jenkins were the senior partner. In the new union, he was joint general secretary with John Dutton of AScW, but by 1970, he was sole general secretary with a vision of what "his" union could become.