Original: They are often the target of pranks, known collectively as gnoming: people have been known to return garden gnomes "to the wild", most notably France's "Front de Liberation des Nains de Jardins" and Italy's "MALAG" (Garden Gnome Liberation Front).
Simplified: They can be the target of pranks: people have been known to "return to the wild" these garden gnomes, most notably France's "Front de Liberation des Nains de Jardins" and Italy's "MALAG" (Garden Gnome Liberation Front).