The Union Bears have called out "flagrant and unwarranted abuse of power" by Police Scotland before the match between Celtic and Rangers.
The supporter group issued a statement on Friday afternoon revealing legal action has been pursued over a Section 60 order. The law, under the Criminal Justice and Public Order Act 1994 allows officers to stop and search people where appropriate or necessary.
Police officers are also permitted to reacquire the removal of any item they believe is being used wholly or partly for the purposes of concealing a person's identity.
The power was in force throughout Glasgow from 8am on Sunday, March 16 until 11.50pm on the same day.
— Union Bears (@UnionBears_07) March 21, 2025
The Union Bears correspondence, on the X page, also questions the legality of the "search and seizure tactics employed" in the policing ahead of the derby fixture at Celtic Park.
The Union Bears have demanded Rangers chiefs break their silence over the matter, stating the club "appear solely interested in demonising supporters rather than standing in their defence".
Video footage from outside the ground appeared to show a number of Union Bears members being led away from the ground before kick-off with reports the group were denied entry.
The statement read: "Last Sunday, our supporters endured a flagrant and unwarranted abuse of power through Police Scotland's deployment of Section 60 authority - an action we believe was unlawful.
"Despite repeated attempts to liaise with Rangers, it has been made clear that they have no desire to engage with their supporters in any meaningful way.
"The club's silence speaks volumes - they appear solely interested in demonising supporters rather than standing in their defence.
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"We have now pursued legal advice for all those subjected to this overreach and have formally challenged both the legitimacy of implementing Section 60 order without proper justification and the questionable legality of the search and seizure tactics employed.
"We demand that the club break its silence, publicly acknowledge this abuse of power, and exert its influence to compel Police Scotland to account for their actions and explain how they could possibly justify the imposition of such measures against supporters.
"Union Bears. No Surrender."
It comes after Rangers released a stinging statement blasting a Union Bears display during the Europa League match against Fenerbahce.
The club was charged over the “racist and/or discriminatory banner” by UEFA and condemned the display which was held in the Copland Stand.
It read: "Keep woke foreign ideologies out. Defend Europe."
