After a career in business and trade union leadership, he won a seat in the House of Commons in 1935, and held it until his death in a road accident.
[2] He was chairman of the York Trades and Labour Council,[3] and became president of the Amalgamated Union of Co-operative Employees, of which he was the chief founder.
[5] In December 1935 he was a speaker at the Congress of Peace and Friendship with Russia, held in Friends House on the Euston Road in London.
[6] In July 1936, he was one eleven MPs who sent a telegram to Prime Minister of Spain expressing their "admiration of the heroic fight being put up by the Spanish people against the attack of Fascists".
[2] In May 1940, when Herbert Morrison became Minister of Supply in the wartime coalition government, Jagger was appointed as his Parliamentary Private Secretary (PPS).