Comrade Texada Wolf
Redem
They disbanded, that's about as "went away" as you can get. There are a few people still fighting the war the commanders called of years ago, c'est la vie. This is hardly the first example of the phenomenon.
By 'disbanded' you mean 'they lost the main supplier being The people of US (mostly the 'Irish' Americans who are as Irish as I Byzantine) because they learnt that funding terrorism was not fun any more after some dudes hit some towers with aircraft'
and thus could not do anything any-more.
bar randomly shooting some soldiers and Police officer and failing to bomb s**t.
Unrelated, the peace process was completed in 1995, with the Good Friday Agreement. The rest was compliance checks.
As for 9/11, meh. Terrorism has little meaning except that it applies to the people we call enemies. When we do it, it's just fine and dandy, like the terrorists in the revolutionary war that the US now calls patriots and heroes. :p