Your autocorrect keeps messing with you Dan.
assignation
ˌa-sig-ˈnā-shən
noun
1. the act of assigning or the assignment made
2. an appointment of time and place for a meeting tryst
The word you need is assassination.
assassination
as·sas·si·na·tion ə-ˌsa-sə-ˈnā-shən
1. murder by sudden or secret attack often for political reasons : the act or an instance of assassinating someone (such as a prominent political leader)
2. treacherous destruction of a person’s reputation
They did that for four years, and then three more when he moved to the front of the line again, and all failed, hence they went for door number one.