What is the {secret police} for {commander of} of {Lavrentiy Beria}
What secret police organization was led by Lavrentiy Beria ?
 select distinct ?obj where { wd:Q141829 wdt:P598 ?obj . ?obj wdt:P31 wd:Q214183 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q141829> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P598> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q214183> } 
What organization did Lavrentiy Beria lead?