He started his own business in partnership with Peter Neilson (who also became a Labour MP) after victimisation by employers.

[1] Munro was president of the Dunedin branch of the Independent Political Labour League (IPLL) in 1907.

Statham resigned after the election after irregularities in the counting of the vote turned a 12-vote lead for Munro into a 12-vote loss.

[10] He was not appointed a minister in 1935 as he had a reputation for being lazy, and had embarrassed Savage a week before the 1935 election by stating that: He was on the Dunedin City Council (1927–1945) and Otago Harbour Board.

[14] His son, David Johnston Munro, was Labour's parliamentary candidate for the Wallace electorate at the 1946 election.