The title is Italian for them, as in the movers, shakers, petty crooks and parasites who hover around power like moths to a flame. (Place an apostrophe in the right place, and you get l’oro: the gold.) But Loro, director Paolo Sorrentino’s gorgeously gaudy, chalice-runneth-over satire, is really about one person: Silvio Berlusconi. The first time you see the Prime Minister is by proxy, via a lower back tattoo of his face on a young woman. When the man, played by Italian cinema’s reigning chameleon Toni Servillo,...