Which preposition to use with vilifications

of Occurrences 5%

I cannot feel sure how my voting will affect the condition of Central Asia in the coming ages, but I have good reason to believe that the future populations there will be none the worse off because I abstain from conjectural vilification of my opponents during the present parliamentary session, and I am very sure that I shall be less injurious to my contemporaries.

Which preposition to use with  vilifications