The administration of Jair Bolsonaro, sworn into office Jan. 1 as Brazil's president, faces numerous security challenges, including high crime rates in several of Brazil's major urban areas, a major refugee influx from neighboring Venezuela, and the threat of criminal militias continuing to expand their operations out of Colombia and Venezuela into northern Brazil. His policies may exacerbate the risks to foreign organizations from crime, political unrest, and left-wing and jihadist violence....