Marro was an associate of Karpse who was creating gas for a foreign power.  Marro was jealous of Karpse’s involvement with a foreign agent named Halone and so tipped off Dick Tracy to investigate Karpse’s molasses shipment on the train that Jojo Nidle tried to rob.  Marro would show up several times in the investigation and evaded arrest after Karpse was killed.

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