Union activists today held up hundreds of red cards in a sign of anger at the treatment of migrant workers in Qatar, where the 2022 football World Cup is being held.
The TUC Congress in Liverpool called for Qatar to be stripped of hosting the tournament unless working conditions were radically improved.
The conference heard that since the country was awarded the World Cup in 2010, more than 1,300 construction workers from India and Nepal have died.
Football's world governing body Fifa was urged to take urgent action improve working and living conditions for migrant workers building stadiums and other sites for the tournament.
Neil Vernon of construction workers' union Ucatt, told the conference that workers had been "slaughtered" to fuel a construction boom, warning: "Thousands more workers will die before the World Cup in 2022 unless action is taken now."
Vicki Grandon of Unite said Fifa should act to stop the World Cup in Qatar becoming a "graveyard".