Samuel "Sam" March (1861-10 August 1935) was a trade union official and Labour Party politician active in the Poplar area.
A member of Poplar Borough Council from 1906 until 1927, he was Mayor of Poplar in 1920-21. During his mayoral term he was jailed for taking part in the Poplar Rates Rebellion.
He stood for parliament for the constituency of Poplar South at the 1918 general election but was not elected. At the next general election in 1922 he was elected to the House of Commons and held the seat at the next three elections, standing down in 1931.
He was also a member of the London County Council for Poplar South from 1919-1925.
He died at his home in East Ham aged 74.
Wikipedia page [1].
Hansard references here
James Lovelock is related to him [2]