Its a big question, but I'll at at least try to make a start.Leftist political parties are characterised by socialist policies, such as universial health care, free education,businesses under more government regulation,more even distribution of wealth,less privatisation of essential services(electricity, water,etc) Plus they are on the left of the political spectrum which is the liberal side if they were on the far left of the political spectrum they would be considered radicals or extreme liberalist
NSDAP National Socialist German Workers Party. NAZI Party
Revolutionary Left Party was created in 1940.
Left Party - Sweden - was created in 1917.
Democratic Party of the Left ended in 1998.
Radical Party of the Left was created in 1971.
Liberal Left Party was created in 1909.
Liberal Left Party ended in 1945.
Left Party - France - was created in 2008-12.
He joined then left the Communist Party.
Revolutionary Party of the Nationalist Left was created in 1963.
Party of the Democratic Left - Slovakia - ended in 2004.
Party of the Democratic Left - Slovakia - was created in 1990.