What is the Gaza Humanitarian Foundation and why is it controversial?

As famine threatens Gaza, humanitarian aid sites will close on Thursday. The remaining food distribution centers are operated by the Gaza Humanitarian Foundation (GHF), which says it is conducting maintenance and repairs at these locations. Backed by Israel and the US, the GHF has taken over from all other aid organizations in Gaza, including the UN. However, the international humanitarian community criticizes the newly established group for not following basic humanitarian principles.