Scotland's 12 Premier League football clubs have agreed to punish any club whose fans show support for guerrilla groups.
The move follows a series of incidents this year - most recently Celtic were fined 25,000 dollars last week by European soccer's governing body UEFA after their fans sang pro-Irish Republic Army chants at a Europa League match against the French club Rennes early last month.
Earlier this year Celtic's arch-rivals Rangers were fined 70,000 dollars by UEFA, and their fans banned for one away match in European competition, for singing sectarian songs at a Europa League match against PSV Eindhoven.
