- Mathilda Grimblehawk: "We're with the Ministry of Magic, Mr Crump. We suspect you're planning some kind of mischief."
- Silas Crump: "Who, me? Silas 'Saintly' Crump? Never done mischief in my whole life! […] Entrepreneurial, that's me. Self-sufficient! I'm a shining example to the wizarding community."
- — Mathilda Grimblehawk and her partner confront Silas Crump at the Leaky Cauldron[src]
During his life as a criminal, he had been evading capture by Officer Cerberus Langarm from the British Ministry of Magic's Department of Magical Law Enforcement. This was due to the fact that he had never been caught red-handed.
Crump may have been in Slytherin House at Hogwarts School of Witchcraft and Wizardry as there was a Slytherin scarf in his rented room at the Leaky Cauldron. His cunning and resourceful personality would also seem to support this. There was also a Chudley Cannons flag in his room, so he was most likely a supporter of them.