the 'old Left' can include everything from the International Workingmen's Association to Eugene Debs to Marxist-Leninism to the 4th International to the Tallahassee Bus Boycott?
I tried to condense the categories as much as possible. If I were to expand on it, it would be more like this, I suppose -
1864-1886: The First Left (from the International to Haymarket)
1886-1917: The Second Left (from Haymarket to the Russian Revolution)
This is where it gets tricky
1917-1935: The Third Left (Russian Revolution to the Popular Front)
1935-1956: The Fourth Left (Popular Front to Hungarian Revolution)
1956-1968: The Left in Crisis (Hungarian Revolution to May '68)
1968-1979: The New Left (May '68 to Thatcher)
1979-1991: The Left in Retreat (Thatcher to the collapse of the USSR)
1991-1999: The Dispersed Left (USSR to Seattle 1999 protests)
1999-2003: Alter-Globalization Left (Seattle to Iraq War)
2003-2011: ? No idea for what name to give this one (Iraq War to Occupy)
2011-present: Horizontal Left / Intersectional Left (Occupy to now)