Kneecap

Kneecap are a great example of the trend of mixing  aestheticised republicanism (most visibly with the tricolour balaclava) with revisionist leftist ideology.

Aestheticised republicanism means republican trappings and symbols but without the substance.

See here.

Their use of the rap/hip hop genre also strengthens this linkage, drawing upon "Blacks of Europe" notions. 

According to one band member:

“Rebel music in Ireland has all the same sort of ideas as hip-hop in America. A community that’s oppressed, using songs to revolt in some way,” according to ‘Mo Chara’.