Krivitsky told Chambers it was their duty to inform .
Levine had introduced Chambers to Walter Krivitsky , who was already informing American and British authorities about Soviet agents who held posts in both governments .
Walter Krivitsky told Chambers it was their duty to inform .
Levine had introduced Chambers to Walter Krivitsky , who was already informing American and British authorities about Soviet agents who held posts in both governments .