The first big Bidah of Islamic tradition was that of fitnah of Najd, commonly called as Wahhabism. This fitnah started in Saudi Arabia has taken its toll to kill many muslims there. it started in Najd and the king saud supported it (wallaho alam). they succeeded it with money of the west (Zionists) and killed many muslims. Read Mushkawat shareef to read the Hadiths of Holy Prophet (Sallalaho ali wassalam) in this regard. they are an EYE OPENER. Today a section of this fitnah wants to have same degree of fitnah in other parts of the world too, especially in the subcontinent.