The recent disclosure that Mormons baptized the dead parents of Jewish Nazi hunter Simon Wiesenthal by proxy has sparked outrage in the Jewish world. The Church of Jesus Christ of Latter-day Saints has apologized for the baptism, which it says resulted from the actions of a church member acting in violation of church policy. The LDS church vowed to stop baptizing Jewish Holocaust victims in 1995.

But proxy baptism of the dead is a proud Mormon tradition. Here are the basics about how it works and why Mormons do it.