Rudd, maybe not. She's been used as a human shield for Theresa May. May oversaw the introduction and implementation of the Immigration Act 2014, which is an example of institutional racism imo and the main cause of the Windrush scandal.
Something that the "cretinous" Diane Abbott warned about at the time, in Parliament (and therefore voted against, one of the few MPs who was brave enough to go against The Daily Heil that most of our politicians are so scared of). The "competent" Theresa May said, at the time, that this had all been taken into account and everything was fine. Either she knew the policy would end up trying to turf out a bunch of black British people and didn't care (racist) or she was just sh1t at her job and had no idea that this was a possible consequence.
The incompetence of Theresa May outdoes Abbott by orders of magnitude, yet some people were fine with her as Home Secretary and some of them seem fine with her as Prime Minister. For all of her faults and her general awfulness infront of a camera/microphone, I'm not aware of Diane Abbott implementing policy that disproportionately hurts a minority group, detains them, deports them, denies them access to healthcare etc. Some smartarse will probably come back with a tweet or something, but what's worse - a tweet or actually ruining someone's life?