Additional District Judge Amar Pal Singh held the trio guilty yesterday and also imposed a fine of Rs 10,000 each on them.
In November 1997, a woman was gangraped by Vijay Gupta, Bhuttu Singh and Amar Jeet Singh in Dokati area.
An FIR was lodged by the victim's father-in-law after which a charge sheet was filed by police in the court.