Question: For what causes did the artist who recorded "Freedom Dub" fight in his life?
Answer(s):
answer: Nonviolence
answer: Anti-racism
answer: Anti-Apartheid
answer: Humanitarian
answer: Black Liberation
answer: Civil and political rights
answer: African Americans' rights

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:music.featured_artist.recordings ns:m.016bsl4 . 
?c ns:base.activism.activist.area_of_activism ?x .
}