Two surprising guests joined Donald Trump onstage at his Thursday night rally in the Bronx. Rappers Sheff G and Sleepy Hallow — who were indicted last year as part of an investigation into a vast murder conspiracy by two Brooklyn gangs — exchanged warm words with the presumptive GOP presidential nominee in Crotona Park. Sheff G, known to the government as Michael Williams, was out on bail set last month at $150,000 cash or $1 million bond for conspiracy charges and multiple counts of murder, assault and criminal possession of a weapon in the case covering 27 different acts of...