Games, notably the winning of a then-record seven gold medals by United States swimmer Mark Spitz, Finland's Lasse Virén taking back-to-back gold medals in the 5,000 meters and 10,000 meters, and the winning of three gold medals by Soviet gymnastic star Olga Korbut, who achieved a historic backflip off the high bar. There was no such tragedy at the 1976 Montreal Games, but bad planning and fraud led to the cost of these Games far exceeding the budget. Costing $1.5 billion (equivalent to $ billion in ), the 1976 Summer Games were the most expensive in Olympic history (until the 2014 Winter Olympics) and it seemed, for a time, that the Olympics might no longer be a viable financial proposition. In retrospect, it is believed that contractors (suspected of being members of the Montreal Mafia) skimmed large sums of money from all levels of contracts while also profiting from the substitution of cheaper building materials of lesser quality, which may have contributed to the delays, poor construction, and excessive costs. In 1988, one such contractor, Giuseppe Zappia "was cleared of fraud charges that resulted from his work on Olympic facilities after two key witnesses died before testifying at his trial". The 1976 Games were boycotted by many African nations as a protest against a recent tour of apartheid-run South Africa by the New Zealand national rugby union team. Romanian gymnast Nadia Comăneci made history when she won the women's individual all-around gold medal with two of four possible perfect scores. She won two other individual events, with two perfect scores in the balance beam and all perfect scores in the uneven bars. Lasse Virén repeated his double gold in the 5,000 and 10,000 meters, making him the first athlete to ever win the distance double twice. End of the 20th century Following the Soviet Union's 1979 invasion of Afghanistan, 66 nations, including the United States, Canada, West Germany, and Japan, boycotted the 1980 Games held in Moscow. Eighty nations were represented at the Moscow Games – the smallest number since 1956. The boycott contributed to the 1980 Games being a less publicised and less competitive affair, which was dominated by the host country. In 1984 the Soviet Union and 13 Soviet allies reciprocated by boycotting the 1984 Summer Olympics in Los Angeles. Romania and Yugoslavia, notably are the only two countries from the Eastern Bloc that did attend the 1984