Four men stand holding picket signs referencing stances on immigration.
They are immigrants themselves.
Just because men are picketing about immigration doesn't mean they're immigrants.
exists e1 p1 x1.(exists e2 e3 x2 x3 x4 x5 x6.(Theme(e3,x2) & Actor(e3,x1) & v_hold(e3) & on(e2,x6) & n_immigration(x6) & Theme(e2,x5) & Actor(e2,x4) & v_reference(e2) & n_stance(x5) & (x2 = x4) & n_sign(x2) & of(x2,x3) & n_picket(x3)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & n_man(x1) & card_eq_4(x1))
exists p1 x1.(n_thing(x1) & exists x2.((x1 = x2) & n_person(x2) & n_immigrant(x2)))