Iron Fist

Iron Fist (アイアンフィスト, Aian Fisuto) is a gang located in N-City. It is N-City's biggest gang.

Psychic Sisters Arc
Iron Fist holds Erika hostage and lures Feather out to fight them. Feather manages to defeat multiple gang members but is also beat down in the process. Despite taking out a good amount of them, the Iron Fist members gloat about their victory against Feather. They call him an idiot for being tricked so easily and trying to single handedly take on the top gang in N-City.

When he asks about the woman, Erika arrives telling Feather that she has been fooling him their entire relationship, and sarcastically thanks him for not noticing her bad acting. She says she is the girlfriend of Iron Fist's leader, Big Iron, who sent her to spy on Feather pretending to be a helpless woman in fear of Iron Fist. After hearing this, some Iron Fist members chuckle calling her a scary woman, on the other hand, Feather laughs saying that she really is a bad actor. This suggests he knew she was currently playing a part, and their relationship is genuine, she sheds a tear proving he is right. Noticing that Iron Fist still hasn't killed Feather, Big Iron becomes aggravated and proclaims he'll do it himself. Meanwhile, Feather concludes that Erika isn't a hostage, and prepares to let loose. He seems to gain a second wind and hypes himself up. Before anything happens however, Tatsumaki sends Saitama flying through the wall and knocks out Feather.

Saitama sees the people Feather knocked out on the floor and apologizes. While Saitama argues with her over who is at fault for the damage, the gangsters recognize Tatsumaki. They become intimidated then frustrated thinking Feather called for backup heroes. Big Iron rallies his members to fight and not fear an individual S-Class hero, telling them that it would look good if Iron Fist turned the tables. Taking him for a weakling who is just in the way, Big Iron slams Saitama in the head. Unfazed, Saitama sends him flying through the ceiling. Iron Fist becomes enraged and collectively rushes Saitama. Becoming impatient, Tatsumaki levels their hideout and incapacitates the remaining gang members.