amsterdam digital privacy advocate hope force repeal law give dutch intelligence agencies new surveillance power say monday gather enough signatures demand referendum range activists politicians media group oppose law pass healthy margin july give agencies power gather data covertly large group people petition referendum must submit vote commission vet whether meet 300,000 signature threshold government oblige hold non-binding referendum whether law uphold likely together municipal elections march 21. cross line large group innocent civilians drag sight secret service trawl net say david korteweg lawyer online right group bits freedom statement government argue expand power need spy agencies counter threats national security use test oversight panel referendum law controversial may repeal pass 2015 first use block dutch government ratify economic treaty european union countries negotiate ukraine large vote referendum embarrass hague force prime minister mark rutte seek minor amendments treaty late emerge signatures hold ukraine referendum gather via internet never vet referendum likely dutch 'tapping law