- Collusion is question of fact to be proved by consistent conduct of a party leaving no reason to believe that party was not in league or in conspiracy with other for some evil purpose or to defeat the right of a person — It has to be proved by the party who alleges it. Nazar Ahmed & 8 others v. Fazal Hussain & 11 others 2005 SCR 75 (C) AIR 1967 SC 878, AIR 1970 All 108 ref.