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Gamma is an A ranked member of the Millefiore Family, who commands the 3rd attack squad of the Black Spell. According to Lal Mirch, Gamma is responsible for wiping out many of the allies of the Vongola Family. Gamma defeats Hayato Gokudera and Takeshi Yamamoto later interrogating Gokudera. Before Gamma killed them however, Kyoya Hibari arrived and defeated him.

Source from Wikipeida