At Hogwarts school,Tom Marlovo Riddle became very good at all subjects, he was a reponsible perfect and was trusted by all teachers, except Professor Dumbledore( because of what Tom said to Dumbledore and Tom was a little child, Dumbledore has never believed him truely). Actually, he did that to lie teachers about bad things he did at Hogwarts. 'Tom Marlovo Riddle' is ' I am Lord Voldemort'. When Tom was still in Hogwarts, he was protected by a group of student at Slytherin, whom he called" friends'', but actually, whom he had no compassion, and most of them will become Death Eaters. In his sixth year at Hogwarts, he opened the chamber of secrets, made Basillik free, and Basillik killed a muggleborns-student called Myrtle. Then he imputed to Hagrid,a third-year-student and his giant spider, so Hagrid was expelled from Hogwarts, and Tom was awarded for special merits to Hogwarts school. Noone doubted Tom, except Dumbledore. But Dumbledore didn't say anything, just hold Hagrid and made him becomes the key-holder for school.