Concluding its final arguments in a 1984 anti-Sikh riots case involving senior Congress leader Sajjan Kumar, the CBI on Monday told a Delhi court that a conspiracy of “terrifying proportion” was hatched with his “patronage” during the riots. “There was a conspiracy of terrifying proportion with the complicity of police and patronage of local MP Sajjan Kumar,” CBI prosecutor R S Cheema told District Judge J R Aryan, arguing that this was reflected in the statements of various witnesses in the case.