Question:
Which political party did Sergio Chiamparino belong to in Nov, 1999?

Context:
 Sergio Chiamparino is a member of the Democratic Party from Jan, 2007 to Dec, 2022. 
 Sergio Chiamparino is a member of the Democratic Party of the Left from Jan, 1991 to Jan, 1998. 
 Sergio Chiamparino is a member of the Democrats of the Left from Jan, 1998 to Jan, 2007.

Answer:
Democrats of the Left