What Italian actor did M1 , M2 , M3 , and M4 employ
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.actor .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
?x0 ns:people.person.nationality ns:m.03rjj
}