The Mamushi brothers, Taizo, Manzo and Kichizo, are three slavers who own the Mamushi Farmstead. They once held Yuna and Taka and now work for the warlord Altan. In Silent Death you sneak in to deal with them.
To scare Altan's men, Jin has to stay unseen and kill only the three brothers. Stealth and Ghost tools work best here.
Jin kills them and puts their heads on stakes to provoke Altan.