Treason Grind is the band Forræderi.
A song of theirs, 'Fantasibilder', features on the album 'A Tribute to Nasum', but has been incorrectly credited by the label (the bandname as well as the song title). From their myspace page:
Footnote: Power it up records really fucked this one up. We are listed as "treason grind - fantasi nesten" on this one.. how the hell they got it so wrong is a mystery..

Read more about Treason Grind on Last.fm.