In 1950, he became general secretary of the metalworkers, and he spent some time studying at the Higher Party School in Moscow, in 1951/52.
On his return, he was appointed as deputy general secretary of the National Council of Trade Unions (NCTU), and in 1954 he was promoted to become its president.
During the Soviet invasion of Hungary, he was loyal to János Kádár, arguing in favour of multi-party democracy, but against the workers' councils.
He was one of the leading founders of the Hungarian Socialist Workers' Party (MSzMP), and remained on its central committee, and was its secretary until 1962.
[1] Gáspár opposed the reforms of the late 1980s, and stood down from the NCTU and the central committee of the MSzMP in 1988.