Student's sexual harassment in my school

I am the student of St.Joseph’s High School CBSE, which is famous all over the India. This school is really best but some students are the worst. During lunch break when the smaller boys go to washroom or toilet, the groups of the elder boys of Std.IX abuse them. The names of the leaders of these groups are:-
1. Shashant
2. Sudipto
3. Abhishek
Sexual harassment in school premises is just a curse for students who are there to study not to cut capers. These rascals not only harass but also threaten the victim not to tell the teachers and guardians. Nobody even dare to raise the vice against them but I am making a start to give word of those dumb feelings. We will make a change, I do believe.