Celtic fans interrupted their Scottish Premiership match at Dundee with a protest against the club’s hierarchy.Tennis balls and even oranges were thrown onto the pitch in an organised protest from supporters.Furious fans protested against the club’s hierarchy at Dens ParkPAThis prompted the referee to halt the game moments after kick-off.There were chants of ‘sack the board’ from the away fans as banners were also raised.Players and staff were forced to join in picking up and removing the balls from the pitch so the match could restart.Goalkeeper Kasper Schmeichel was seen trying to get the protesters to calm down, but his pleas fell on deaf ears.The game was stopped for around three minutes before the referee was able to resume it.Commentating on the game for Sky Sports, James McFadden said: “I don’t think this will be the last protest we see from the Celtic fans.“I think you can safely say, point made.“It’s going to take a while to get all those balls off the pitch.“The players just want to get on with the game.”Things did not go well on the pitch either with Clark Robertson and an own goal from Cameron Carter-Vickers giving Dundee a 2-0 lead at Dens Park.View Tweet: https://t.co/1xDaG8j3iWThe Hoops are currently second in the Scottish Premiership behind leaders Hearts, who have dropped just two points all season.Why are Celtic fans protesting?Supporters are furious with the club’s board and have launched direct action in recent weeks.A fan group has started the ‘Not another penny’ campaign in the hopes of getting other Hoops fans to not buy merchandise or spend money in the ground.A statement read: “For too long, the Celtic board has taken supporters for granted. “They are responsible for repeated failures in Europe, an archaic transfer strategy, a collection of NEDs who have grossly out-stayed their welcome, inflated ticket prices and unfair distribution, a neglected stadium, a stale atmosphere, a non-existent fan engagement model, an underperforming academy, an underfunded Women‘s team, and a pitch unfit for playing football the Celtic way.“These are just some of the failures which expose an out-of-touch board and make a mockery of their claim to be “world class in everything we do.”Dundee were leading Celtic 2-0 at half-timePAOne banner at the Dundee game had the faces of Peter Lawwell, Michael Nicholson, Dermot Desmond, and Chris McKay on it – members of the Celtic board.Nicholson and McKay were both in attendance at the match.