In the Order of the Phoenix, we are told that Amelia Bones is a high-up member of the Ministry (she was Head of the Department of Magical Law Enforcement).
We also find out (from Moody) that her deceased brother, Edgar, was a member of the Order of Phoenix.
Given Fudge's keenness to ostracize supporters and associates of Dumbledore, how did she keep her post? (I presume that she is old and many years into her job, from her appearance.) Mr Weasley was ostracized, wasn't he?
... but Fudge won't let him borrow so much as an empty ink bottle these days ...
Luna Lovegood, the Order of the Phoenix
And others were in risk of losing their jobs if they spoke up
"Tonks and Arthur would lose their jobs at the Ministry if they started shooting their mouths off," said Sirius...
The Order of the Phoenix, the Order of the Phoenix
So why didn't Amelia lose her job?
The only explanation I can offer is that, like Kingsley, her brother's involvement in the order was secret, but that raises the question of whether she knew about his involvement, and whether she was a member herself (which I seriously doubt).