Question: Who is the founder of the trade union which affiliates Amalgamated Association of Iron and Steel Workers?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Amalgamated_Association_of_Iron_and_Steel_Workers> <http://dbpedia.org/ontology/affiliation> ?x . ?x <http://dbpedia.org/property/founded> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TradeUnion>}