Philadelphia police broke up a Memorial Day party in the city’s Brewerytown neighborhood that attracted hundreds of young people, none wearing masks. “Traffic could not get by, even pedestrian traffic walking on the sidewalks could not get by,” Philadelphia Police Chief Inspector Scott Small said. Videos posted on social media captured the crowd, estimated to be as large as 250 people, gathered near the intersection of 28th Street and Cecil B. Moore Avenue. “Turns out the crowd was there listening to a DJ playing some music and because of social media, the crowds grew really large and very rapidly,” Small...