Green by Greenpeace or environmental causes.
Pink by breast cancer foundations.
Blue (Big Blue) by IBM.
Of course, sometimes the colour instead of the ideas behind the colour can become a loaded-baggage like someone being branded “green“, which is why Kevin Roberts has suggested changing from Green to True Blue.
For other writers’ articles, see 2weeks 1gathering.
P.S. Some years ago, possibly after a random chat with my dad, I started to think about colours in reference to the Pantone colour matching system. In hindsight, I think that was a very “business-oriented” and scientific way of thinking about colour.