` Abdu ` l-Bahá first used the term `` Universal House of Justice '' to distinguish the supreme body from those local ` Houses of Justice ' to be established in each community , and the secondary ` Houses of Justice ' ( current Bahá ' í national spiritual assemblies ) .
His son , ` Abdu ` l-Bahá called it the Universal House of Justice , because it was going to lead all of the Bahá ' ís .