In a wave of staggered protests, five groups of loud and persistent activists disrupted Hillary Clinton’s speech at a rally here on Thursday. The incident marked the latest, and rowdiest, in a series of public actions meant to press Clinton to disclose her stance on the executive actions to slow deportations that President Obama is expected to announce after the midterm elections. For about 10 minutes of a stump speech at the Ritchie Coliseum at the University of Maryland College Park, Clinton had trouble making her words heard over the shouts and hollers from the immigration activists with United We...