The U.N. agency for Palestinian refugees, banned from operating in Israel by the Israeli parliament on Monday, is seen by some as an "irreplaceable" humanitarian lifeline in Gaza, but as an accomplice of Hamas by others.

The United Nations Relief and Works Agency for Palestine Refugees (UNRWA) has for more than seven decades provided essential aid and assistance to Palestinian refugees.

The agency has also long been a lightening rod for harsh Israeli criticism, which has ramped up dramatically since the start of the war in Gaza, following Hamas's deadly Oct. 7 attacks last year.