Mercenary Ninja

is a skilled ninja who is hired to fight for another country other than his own in lieu of money. Several mercenary ninja showed up who thought "Naruto" to be a missing-nin and they decided to capture him to obtain money from Konohagakure.

Trivia

 * When Zabuza Momochi and Haku defected from Kirigakure, they became mercenaries for hire.
 * Akatsuki is a mercenary group.
 * Before the founding of hidden villages, nearly all shinobi were mercenaries (and technically they still are).