[1] In 1903, Guy helped establish the Tasmanian Workers' Political League, the predecessor of the modern Australian Labor Party (ALP), and was elected as the organisation's inaugural treasurer.

In parliament he supported the abolition of the Legislative Council, higher salaries for MPs, and the implementation of wage controls.

[3] He spoke frequently on social policy, supporting the establishment of widow's pensions and full prohibition of alcohol, specifically "the importation, manufacture, and sale of wines, beer, and spirituous liquors throughout the Commonwealth".

[1] Guy remained with the ALP following the party split of 1916, serving in the Senate until 30 June 1920 following his defeat at the 1919 election.

In 1917, there were rumours he had feigned illness in order to allow the Hughes government scope to cancel the upcoming federal election.