The pop five-piece, who release new single 'Glad You Came' on July 10, made the move after fans managed to track them down in hotels and slip past security.
"Label bosses are worried about the safety of the guys after die-hard fans were caught booking rooms in the same hotels and sneaking past police barriers," a source told the Daily Star.
"So they have hired some ex-SAS blokes to help keep security tighter and the fans calmer. Wherever The Wanted go now it's hysteria."
The Wanted will play a number of festivals this summer, including an iTunes Festival gig tonight, T4 On The Beach this Sunday and V Festival on August 20-21.
> Exclusive: The Wanted: 'Horny mums love us'
Watch Digital Spy's recent interview with The Wanted below:
Watch the music video for The Wanted's 'Glad You Came' below: