A.T. Robertson Commentary Mark 15:3

"And the chief priests accused him of many things." — Mark 15:3 (ASV)

Accused him of many things (κατηγορουν αυτου πολλα). Imperfect tense, repeated accusations besides those already made. They let loose their venom against Jesus. One of the common verbs for speaking against in court (κατα and αγορευω). It is used with the genitive of the person and the accusative of the thing.