Possible Clues:

• Sworn declaration
• Open statement
• To be upfront about this sort of thing, this is a promise from gangster
• Confession
• Declaration (of truth)
• A promise to gangster in confession
• Declaration of love — wife in reciprocal hot outpouring
• Confess openly with a solemn promise to gangster
• Assertive declaration
• Legislation overturned after a very ordinary confession