Voldie only had people infiltrate the ministry or control the ministry.
Voldie also arranged for the death of Scrimgeour & the Ministry fell.
pretty much amounts to 'changing governments'.
But I agree - he didn't try to use 'conventional methods'.

oh and teddy - eowyn is simply a wonderful character. Nothing magical. Just bittersweet and cold. driven with a sense of right and valour.
simply wonderful.

which - given the time the book was written - simply remarkable to be afforded the second highest honour - to rid the world of the Witch king. (she did not get rid of Sauron) only the destruction of the ring in the fires of mount doom sealed that deal.

(these are my two favourite series (books & film) of all time)