Lobbyist Kenneth Glueck, shown arriving at President-elect Trump’s tech roundtable in December 2016 with Oracle CEO Safra Catz, tends to wield power from behind the scenes. Photo Illustration: WSJ; Photo: Getty Images

Why Are Amazon and Google in Washington’s Firing Line? One Answer Is Ken Glueck. The Oracle lobbyist has emerged as a behind-the-scenes thorn for America’s technology giants