These vertically-integrated institutions were forced to make way for horizontally integrated keiretsu in the '40's.
One of these institutions produced "Golden Bat" cigarettes laced with opioids to increase its customers' addiction. Along with a number of politicians, several leaders of these institutions were targeted in the League of Blood Incident. The successors to these institutions follow the "One-Set Policy" and many are partially financed by sogo shosha. Another of these institutions employed former Sopwith engineers to expand into (*) aircraft manufacturing and has a name meaning "water chestnut". These vertically-integrated institutions were forced to make way for horizontally integrated keiretsu in the '40's. For 10 points, identify these monopolistic companies that dominated the Japanese economy between the Meiji Restoration and WWII.
One of these institutions produced "Golden Bat" cigarettes laced with opioids to increase its customers' addiction.
zaibatsu (prompt on descriptive answers)