Rokugo family

The Scorpion Clan is known in Rokugan to be the Empreror's Underhand. The Bayushi family is the most respectable family of their clan. Most beleive that the Scorpion Clan is involved in nearly every illicit transaction in Rokugan, but the Bayushi maintain a veneer of respectability. For being able to be involved in such actions without taking part on it (at least directly) they have their underhand: the Rokugo family. (SoScorpion, p. 22)

Creation of the Rokugo family
When the Scorpion Clan was reinstated after the Second Day of Thunder, their clan was still tenuous at best. They didn't have enough people and ressources to continue their old practices without big risks of losing their new status, but they had to find a solution, because trading with secrets was their staple. The solution came almost by accident. In the outlying villages of the Bayushi provinces, the Scorpion found a group of ronin bandits in control of most of the ancient Scorpion geisha houses, sake parlors and other enterprises necessary to the information network they tried to rebuild. These bandits, led by a man called Rokugo, who took possession of these holdings easily during the exile of the Scorpion Clan, had maintained and developped such enterprises much like the Scorpion before them, and were conscious that the Scorpion would reclaim their possessions after their return. Rokugo didn't want to leave to the Scorpion what he and his men had gained with efforts, and knowing he didn't could face the Scorpion, he made them an offer: he would keep everything he and his fellows had earned during the Scorpion's exile. He would turn over to the Scorpion all financial records and information that the holding had accumulated in their absence. In return, he expected fealty and the right to continue runing the establishments they had taken over. (SoScorpion, p. 22-23)

The Bayushi were impressed by Rokugos's boldness. Many of their samurai had died in the Clan War, and Rokugo's band was an organized group of clever, resoureful ronin. They would also regain their holdings without bloodshed. The offer was so interesting that the Bayushi could not refused. Thus the Rokugo family was born.

Rokugo had conforted the Bayushi and won, becoming more powerful joining the Scorpion Clan. He built a small castle in the highlands near Kyuden Bayushi, which gives him relatively easy access to all of Scorpion territory. This castle, now as Shiro Kuraishi, doesn't appear on any map. (SoScorpion, p.23)