Socialists from the US and Europe put on a concert in Cuba — just as the country was plunged into third blackout this month Saturday. A convoy of socialists — including streamer Hasan Piker, the daughter of Rep. Ilhan Omar, members of Code Pink and lefty Irish hip-hop group Kneecap — is in Cuba with the goal of supporting Cuba’s oppressive communist regime. But Piker and others have been dogged by criticism for staying in a 5-star hotel in Havana, and Kneecap played a concert in the capital city as the rest of the nation of 11 million people faced...