When aged 16, Carroll fund-raised with fellow activists to travel to Edinburgh, Scotland for the Make Poverty History protest.

At the 2014 Belfast City Council election he gained one of the seven seats in the Black Mountain electoral area from Sinn Féin, coming third.

He said: "There is a lot of anger in West Belfast at the minute over the situation at Royal Victoria Hospital's A&E, the privatisation of leisure centres and the Casement Park issues...residents have been trampled on".

[1] He contested Belfast West again at the 2015 general election,[2] this time coming second, gaining 19.2% of the vote and reducing the Sinn Féin majority from 57.1% to 35.0%.

[6] Carroll's support for Brexit, in an area in which three-quarters of voters voted Remain, has attracted criticism from Sinn Féin and pro-EU activists.