Question: What organization with headquarters in Atlanta led by Martin Luther King?
Answer(s):
answer: Southern Christian Leadership Conference

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.051cc)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.051cc ns:organization.organization_founder.organizations_founded ?x .
?x ns:organization.organization.headquarters ?c .
?c ns:location.mailing_address.citytown ns:m.013yq . 
}