Text: But, in fact, there is no assurance that Greenspan and his colleagues have any actual intention of behaving in this way, nor any persuasive evidence that they have done so in the past.
Entailment: It is unclear to some whether Greenspan and his colleagues actually intend to behave in this way.
Contradiction: Greenspan and his colleagues were caught behaving this way in the past and there is absolute proof of it.