SPANISH Tourism Minister Reyes Maroto has revealed that she has received a knife covered in red stains by post, days after senior security officials and a left-wing party leader were sent death threats. The ministry released a photo showing a small, wood-handled folding knife with a series of red stains running up the blade. "This is serious...We should be concerned as I'm not a controversial person," said Maroto, a socialist who has served as minister of industry, trade and tourism since 2018. "It gives us more strength to defend democracy...Hatred and threats will not silence us," she told reporters outside…