Question: Which politician held their position until 1976-09-09 and led the first communist party of China?
Answer(s):
answer: Mao Zedong

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.02189)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.02189 ns:organization.organization.founders ?x .
?x ns:government.politician.government_positions_held ?c .
?c ns:government.government_position_held.to "1976-09-09"^^xsd:dateTime . 
}