Engineering students are blackmailing their girl classmates and earning huge sums, it is learnt. The have formed in to a group called Johnny Walker. Their modus operandi is to get intimate with the girls, take pictures and then start blackmailing the girls for money. Even some girls are involved in these activities, leading to drug abuse and other notorieties. The police detected the network of operations, when one of the victims approached them. (Some of the visuals are disturbing for children).