[6] With other leading figures from the committee, including John Maclean, in 1920, he founded the Communist Labour Party (CLP), and was elected as its chairman.
As a result, he championed the merger of the CLP into the new Communist Party of Great Britain (CPGB), which was completed at a unity conference early in 1921.
[8] He brought over a captain from the IRA and began drilling volunteers in eastern Fife, although this project was abandoned when he was called away by the CPGB to organise workers in Coventry.
[9] There, he was centrally involved in supporting engineers during the lock-out, and became the leading figure in the Coventry Unemployed Workers' Movement, who planned to stand him in the 1922 general election.
[11] In 1925, Leckie was sent back to the UK to become the British secretary of Workers International Relief, a CPGB-led organisation, with a brief to move it from a focus on funding welfare to a more combative role.