Last night the group played in Budapest at the Sziget Festival, one of Europe’s biggest music festivals.
The mural - with the slogan "Níl fáilte roimh an RUC" - meaning “the RUC aren’t welcome" - was unveiled in west Belfast before a giant gig in Falls Park in front of 10,000 fans as part of Féile an Phobail.
The controversial three-man group rap in both Irish and English, but their songs are so expletive-filled that they don't get airtime on national stations.
The mural at Hawthorn Street was condemned by various politicians, many saying that it would have a bad influence on young people and it wasn't the image the community in west Belfast wanted to send out.
Justice Minister Naomi Long tweeted: "The band in question court controversy: it's publicity and I doubt this latest mural will do them any harm.
“However, the same can't be said of young children being groomed into sectarian hatred. We've seen this all summer: it needs to stop. We owe the next generation better."
Belfast commentator and journalist Amanda Ferguson described the reactions to the mural as “outrage in overtime”.
Meanwhile DUP MLA Emma Little-Pengelly branded 'Ooh ah up the Ra' chanting heard at Sunday's Wolfe Tones concert at the Féile as “deeply disappointing”.
She added: “Shouting about paramilitary organisations, talking about what they’ve done in the past, celebrating, glorifying that, that is never an acceptable form of cultural expression, regardless of whether it’s the IRA or any other paramilitary organisation.
“We are talking about 2022, this is not the Northern Ireland we need to be building, not for this year, not for the future. We all have to work collectively to ensure it doesn’t happen."
SDLP councillor Carl Whyte, whose grandmother was murdered by the UVF, said he was “depressed” at the IRA chants.
Kneecap - made up of Móglaí Bap, Mo Chara and DJ Próvaí, who always wears a balaclava, tweeted: "GRMA (go raibh maith agat, thank you) to the DUP and all our loyal supporters" for helping them to trend on social media.
A bandmember added that the mural was "just a fine piece of art" and added that they didn't mind if anyone was offended.