MEXICO CITY, Dec. 6 - The youngest brother of former President Carlos Salinas de Gortari was found strangled in a car in a rich suburb of Mexico City on Monday morning, law enforcement authorities said. Enrique Salinas de Gortari, a wealthy, 52-year-old engineer from Cuernavaca, was discovered at 7 a.m. by a passer-by in the front passenger's seat of a grey Volkswagen Passat on a quiet residential street. He had a yellow plastic bag over his head and had apparently been strangled. His face was bruised. The killing was the latest tragedy to strike the family of the former president,...