The Red Cross
Begun as a humanitarian activity on the battlefield, to save the lives of soldiers no matter which side they were on, the Red Cross and Red Crescent societies encompass help in times of need in all kinds of forms.
Whether it is blood drives, or assistance during floods, earthquakes, you name it, they are there and their volunteers are on the front lines.
The world would be a much colder, less forgiving place without their familiar symbols showing up when people need it most.