As the vanguard of Kobu-gattai group, (a party of advocating Kobu-gattai which unites the court and the shogunate) Goto clamped down Tosakinno Party (loyalist clique of Tosa) and carried out punishments of the members, including Seppuku (suicide by disembowelment) of Zuizan TAKECHI.
後藤は公武合体派の急先鋒として、武市瑞山らを切腹させるなど土佐勤王党を弾圧する。