It took me ages to do this as I've supported Amnesty for 35 years and it never occurred to me that I'd come to disagree with it enough to end my donation. But I read their gender policy page:
www.amnesty.org.uk/trans-rights
and I thought, that's it, I'm done. I wrote a long letter explaining why. So far this summer I've given up the Graun, PP, NOW, and now Amnesty. I have my fingers crossed Action Aid isn't next as I love their work with women and girls.
I expect others have been through this. Suggestions for alternative charities, esp. in the US, would be helpful. I have given one-off donations to a couple and now want to set up recurring donations.