Career
He joined to the Social Democratic Party in 1923. He was elected to the position of the general secretary of the alliance in 1933. Kossa was taken to the Eastern Front in 1942, where he and many other prisoners joined to the Soviet troops.
On November 1944 he returned to home to make a connection with the Hungarian Communist Party and the Hungarian front.
After the war Kossa led many offices (for example Council of the Trade Union). Kossa was appointed Minister of Industry on 5 August 1948, later served as Minister of Finance until 24 February 1950.
From 5 January 1952 to 2 July 1953 he was the Minister of Metallurgical and Machine Industry. In 1955 he worked for the National Planning Board as first deputy chairman.
From 24 October 1956 he served as Minister of Finance again.
Until his retirement (1963) he was the Minister of Transport and Post.