The Hungarian Soviet Republic or Hungarian Republic of Councils (Hungarian: Magyarországi Tanácsköztársaság or Magyarországi Szocialista Szövetséges Tanácsköztársaság) was a short-lived independent communist state established in Hungary in the aftermath of World War I.
It was the successor of the Hungarian Democratic Republic and lasted only from 21 March until 1 August 1919. The state was led by Béla Kun and was not recognized by France, the UK or the US.
See also People's Republic of Hungary.
More information on the Wikipedia page