But trying to capture a worksite action on film doesn't mean you have to photograph all 35 people walking in a picket line in a single frame. Your photos will be more dramatic if you focus on one element of the event. A basic rule when photographing anything for a publication is to get closer to your subject.
Professional photographers recommend first looking in the viewfinder.
When you think you have your shot, take three to five steps forward and that will be the real photo you're looking for. Here are some examples. DON'T concentrate on photographing the entire sign. DO get a partial piece of the sign but focus on the person. DO capture the emotion of the speaker at the podium.