"The Social Democratic Party of Hungary (Hungarian: Magyarországi Szociáldemokrata Párt, MSZDP) is a social democratic political party in Hungary. Historically, the party was dissolved during the occupation of Hungary by Nazi Germany (1944–1945) and the communist period of Hungary from 1948 to 1989, after being forced into a merger with the Communist Party. It worked legally for a short time during the Revolution of 1956.
It was a government party as a part of the Károlyi Government (1918–1919), Berinkey Government, Peidl Government (1919), Interim National Assembly (1944–1945) and Dinnyés Government (1947–1948). It was reorganized after Hungary's transition from communism in 1989." - (en.wikipedia.org 11.08.2021)
)