Yea, I remember something about that being posted on here as well.
They do the pro Palestinian anti Jewish pish, Ajax being their big rivals.
I have a Dutch mate in Rotterdam, he's been to more than one celtic game.
For some of them there is a connection, and you know full the taigs will be mixing and trying to cause shite.
I remember being at a European game against them years ago, they did a 'charge' in Ibrox, but that was back in the day when they were renowned for it. My mate says them days are in the past.