In 1961, the Frente Sandinista de Liberacion Nacional (FSLN) was founded in Havana, Cuba. The development of the FSLN represented the merger of "Carlos Fonseca's Nicaraguan Patriotic Youth organization ... with Tomas Borge's Cuban-supported insurgent group." The FSLN remained a largely unsuccessful and a marginal political movement until 1972, when an earthquake rocked the Nicaraguan capital, Managua. The Somoza government, which had assumed control of Nicaragua shortly following the withdrawal of United States military personnel in 1933, was seen to be profiteering from international relief efforts in the immediate aftermath of the earthquake. This led to a dramatic change in the influence and importance of the FSLN, as their position within the Nicaraguan public sentiment, began a rapid ascension. Between 1972 and 1978, fighting between the FSLN guerrillas and the Nicaraguan National Guard steadily increased. In 1978 "Pedro Joaquin Chamorro, editor of the opposition newspaper La Prensa" was assassinated; this caused widespread protests and an increase of support for the FSLN including "non-Marxist groups." The opposition to the oppressive Somoza government was beginning to come to a head.