Spencer was an official of the Nottinghamshire Miners Association, which was affiliated to the
Miners Federation of Great Britain. In 1926, at the height of the
General Strike, he negotiated on the behalf of the
Nottinghamshire Miners Association a deal with the local mine owners at the request of miners from Digby Pit, near
Eastwood, in Nottinghamshire. However, that brought him into conflict with the MFGB, which wished to see the strike continue. Unhappy with the influence of the MFGB, he led a breakaway from the NMA and set up the Nottinghamshire and District Miners' Industrial Union (NMIU) based mostly in
The Dukeries, which lasted for eleven years separate from the
Miners' Federation of Great Britain. In 1937, a merger agreement was reached between the NMA and the NMIU, with Spencer becoming the president of the new organisation. ==Political career==