Answer by taking a quote from the following article:

Abebe Bikila (Amharic: 'ababa biqilaa; August 7, 1932 - October 25, 1973) was an Ethiopian double Olympic marathon champion. He won the marathon at the 1960 Summer Olympics in Rome while running barefoot, setting a world record. At the 1964 Summer Olympics in Tokyo, Abebe was the first athlete to successfully defend an Olympic marathon title, breaking his own world record in the process.

Abebe returned to his homeland a hero. He was greeted by a large crowd, many dignitaries and the commander of the Imperial Guard, Brigadier-General Mengistu Neway. Abebe was paraded through the streets of Addis Ababa along a procession route lined with thousands of people and presented to Emperor Haile Selassie. The emperor awarded him the Star of Ethiopia and promoted him to the rank of asiraleqa (corporal). He was given the use of a chauffeur-driven Volkswagen Beetle (since he did not yet know how to drive) and a home, both owned by the Guard.  On December 13, 1960, while Haile Selassie was on a state visit to Brazil, Imperial Guard forces led by Mengistu began an unsuccessful coup and briefly proclaimed Selassie's eldest son Asfaw Wossen Taffari emperor. Fighting took place in the heart of Addis Ababa, shells detonated in the Jubilee Palace, and many of those closest to the emperor were killed. Although Abebe was not directly involved, he was briefly arrested and questioned. Mengistu was later hanged, and his forces (which included many members of the Imperial Guard) were killed in the fighting, arrested or fled.  In the 1961 Athens Classical Marathon, Abebe again won while running barefoot. This was the second and last event in which he competed barefooted. The same year he won the marathons in Osaka and Kosice. While in Japan, he was approached by a Japanese shoe company, Onitsuka Tiger, with the possibility of wearing its shoes; they were informed by Niskanen that Abebe had "other commitments." Kihachiro Onitsuka suspected that Abebe had a secret sponsorship deal with Puma, in spite of the now-abandoned rules against such deals.  Abebe ran the 1963 Boston Marathon, finishing fifth in 2:24:43, the only time in his competitive career that he completed an international marathon without winning. He and countryman Mamo Wolde, who finished 12th, had run together on record pace for 18 miles, until cold winds and the hills in Newton caused both to fall back. The race was won by Belgium's Aurele Vandendriessche in a course record 2:18:58. Abebe returned to Ethiopia and did not compete in another marathon until 1964 in Addis Ababa. Abebe won that race in a time of 2:23:14.8.

What happened in 1960-1964?
Abebe returned to his homeland a hero.