Mečiar was born in Detva in 1942 as the eldest of four boys. His father was a tailor, and his mother a housewife. His wife Margita is a medical doctor and they have three children. Starting in the Communist Party of Slovakia, the only road to prominence in Communist Czechoslovakia, he became committee chairman in the town of Žiar nad Hronom, only to be dismissed in the year after the 1968 Warsaw Pact invasion of Czechoslovakia, when he delivered a pro-reform speech to the national congress in 1969 and was thrown out. A year later he was also expelled from the Communist Party and then added to the Communist Party Central Committee's long list of enemies of the socialist regime. He put himself through the Faculty of Law of the Comenius University while working in a glass factory.