The private Nogal Club in Bogota has long been a central gathering spot for Colombia's political and economic elite, including senior intelligence and security officials, and it has maintained that role following last June's election of leftist President Gustavo Petro. Its status as an upper class haven is precisely what made it a target for the leftist Revolutionary Armed Forces of Colombia, better known by its Spanish acronym as the FARC, which bombed it 20 years ago, in an attack that killed 36