The carnage began in the Glenwood Houses in Brooklyn, where 26-year-old Lamar Antonio Blackwood was shot repeatedly Friday evening. Later that night, another man was murdered in the Bronx and two were killed in Queens. Four men were shot to death and at least five people were wounded in an eruption of violence across the five boroughs overnight, cops said Saturday. The mayhem left a young man lifeless in Brooklyn, a teenage boy murdered in the Bronx and two men killed in Queens, police said. The carnage began in the lobby of an apartment building in the Glenwood Houses in...