Hostage
Part of speech: noun
Definition: A person given as a pledge or security for the performance of the conditions of a treaty or stipulations of any kind, on the performance of which the person is to be released.
Example sentence: In short, it is not that evolutionary naturalists have been less brazen than the scientific creationists in holding science hostage, but rather that they have been infinitely more effective in getting away with it.
Surety
Part of speech: noun
Definition: certaintya promise to pay a sum of money in the event that another person fails to fulfill an obligationOne who undertakes to pay money or perform other acts in the event that his principal fails therein.