The superb story of Ksenia Coffman:

“When Ksenia Coffman started editing Wikipedia, she was like a tourist in Buenos Aires in the 1950s. She came to learn the tango, admire the architecture, sip maté. She didn’t know there was a Nazi problem.”

Coffman is almost single-handedly dealing with Wikipedia’s Nazi problem, from overt political bias to subtle glorification of “war heroes”. Wikipedia is full of unsung heroes like Coffman; I linked last year to a piece celebrating them that’s worth a revisit.