After the assassination of opposition leader among the business elites Pedro Chamorro in January 1978, the Nicaraguan public reacted with a series of nationwide strikes and increasing political unrest against the regime. The National Guard was re-organized and expanded, growing to a force of more than 10,000 officers and enlisted men, with localized security companies dispersed throughout the country and modern specialized units such as mechanized and engineer battalions, a Presidential Guard, and a reinforced tactical battalion. The strengthened National Guard continued to tighten its grip but opposition only grew broader and fiercer. A humiliating hostage crisis ensued on 22 August 1978 when 25 Sandinista rebels disguised as National Guard soldiers led by "Comandante Cero" (Commander Zero) future Contra leader Edén Pastora occupied the National Assembly Palace in Managua, took 2,000 hostages, and escaped to Panama with 50 released political prisoners. The seizure of the National Palace was the second major action launched by the Sandinistas.