Gallacher was born in
Paisley,
Scotland, on 25 December 1881, the son of an Irish father and a Scottish mother. His father died when he was seven years old, and one of his earliest ambitions was to earn enough money so that his mother would no longer have to work as a
washerwoman. With his sisters, he finally achieved that goal at the age of 19, but his mother died shortly afterwards at the age of 54. He began working at 10 years old, and left school at 12. After a spell as a delivery boy for a
grocer, where he had his first dispute with an employer, he found work in a sanitary engineering workshop. He later had a spell as a
steward on some
transatlantic crossings before he began work at
Albion Motor Works, Glasgow, in 1912. After spending 1913 in the United States to visit his sisters in
Chicago, he erected scaffolding in
Belfast. Returning to Glasgow, he again found work at Albion Motor Works in 1914, just before the First World War broke out. The "weakness for alcohol" shown by his father and elder brother, and the suffering that it caused his mother, led him to become involved with the
Temperance movement in his mid-adolescence. However, on discovering that colleagues had canvassed support for a director of a
Trust Public House in the
1906 general election, Gallacher ended his association with the organised Temperance movement. He remained a lifelong
teetotaller. A subsequent period as a member of the
Independent Labour Party ended quickly, and he joined the
Social Democratic Federation, which brought him into contact with
John MacLean. In common with many socialists in mid-west Scotland, Gallacher was greatly influenced by MacLean though they were later to have an acrimonious falling out. The Paisley branch of the SDF introduced him to
John Ross Campbell, who would also become a prominent British Communist and the editor of the
Daily Worker from 1949 to 1959. == Wartime activities ==