When he died in 1923, aged 44, his reputation was such that many thousands of people lined the streets of Glasgow to see his funeral procession pass. In the intervening time Maclean's funeral has become known as the largest Glasgow ever saw. He left a legacy that has subsequently been claimed by both the Scottish Nationalist and Labour movements, making him rare in this respect amongst Scotland's historical figures. The modern Scottish Socialist Party lay claim to Maclean's political legacy, particularly the Scottish Republican Socialist Movement previously a faction (or "platform") within the SSP.