The ride leader should announce the turn will in advance of an intersection, so that members of the pace-line have time to position themselves properly for the turn. Moving to the back of the line can be awkward when in a pace-line. Swing out far enough to the left to let the pace-line pass you safely. Continue to pedal slowly until you are at the end. Pointing down to the left or right informs those behind to watch out for trouble.
Every cyclist is responsible for verifying that the way is clear through all intersections.
Do not assume it is safe until you see for yourself. Here, we look both ways while keeping one foot on a pedal. This will allow you to retain better control of your bicycles. Immature cyclists sometimes come from behind and ride through while other cyclists are taking their proper turn at the intersection. This is highly dangerous and discourteous, and any observers will mark your group as another bunch of crazy cyclists who should not be allowed on the roads.