query: In what comic series did the League of Assassins first appear?
passage: League of Assassins
The League of Assassins (renamed the League of Shadows or Society of Shadows in adapted works) is a group of fictional villains appearing in American comic books published by DC Comics. The group is depicted as a collective of assassins who work for Ra's al Ghul, an enemy of the superhero Batman.
passage: Katana (comics)
After a number of adventures with the Birds of Prey, Katana leaves the group in order to keep an eye on a cult of assassins known as the Daggers. She later accepts membership in Amanda Waller's new Justice League of America in exchange for information on her husband's murderers. When DC launched "Justice League of America", they also launched the solo series "Katana", focusing on Tatsu's abiding mission to track down her husband's killer. The series lasted 10 issues. After this, Katana made an appearance in "Green Arrow" #27 (2014), where she is told by the mysterious blind man Magus that the death of her husband relates to the Outsiders, the society formed of various weapon clans and connected to Green Arrow's new origin story. The Soultaker is worked into the Green Arrow mythology as the totem of the Sword Clan, which has parallels in the Fist, Mask, Shield, Axe, Arrow, and Spear Clans. Representatives from each of these clans make up the Outsiders, a secret society dedicated towards ending global corruption, but which is itself largely corrupt. Katana joins the Outsiders. In "Green Arrow: Futures End" #1 (2014), set five years later in , Tatsu is shown to still be a member of the Outsiders, which has developed a grudging relationship with Green Arrow, who rejected leadership of the Arrow Clan in the main "Green Arrow" series five years before.