Pro-Palestinian activists occupied a building at Columbia University early on Tuesday‚ escalating a battle with administrators who have begun suspending students for refusing to dismantle tents set up on the New York campus. Protesters entered Hamilton Hall - the site of student protests dating back to the 1960s - and suspended a banner reading &;quot;Hind's Hall&;quot; from an upper floor. Others outside blocked the doors with outdoor tables and linked arms to form a barricade in front. &;quot;This...