HOUSTON — They gathered after nightfall at an undisclosed location downtown. People representing more than a half-dozen protest groups that are set to march and rally here Super Bowl weekend met to coordinate their efforts — in a way New England Patriots coach Bill Belichick would have appreciated. That is to say, the protesters discussed using encrypted communication that would keep opponents from intercepting their messages. It was so secretive Tuesday night, not all of the group representatives got the full game plan, said Blake Stroud, who created a group called #ResistHouston to connect the protesters and provided USA TODAY...