TRIBAL people r treated as NULL (tribu+nal) hence they need justice...!!!
Tribunal~Communal ; For all communal(group of ppl/community) problems we need a tribunal
TRIBUNAL or JUDICIAL have the same sound. The words refer to a board of officials appointed to pass judgement over a trial.
tribunal=trib(tribals) - unal(sounds like canal).tribal people have fightings over canals so a cout of justice is required to solve the problem.