Koudelka was a photographer who documented Europe from the 60s onwards, recording the lives of travelling people, Soviet invasions, struggles with poverty, and more. He later became a member of the Magnum society and continued his work into old age. If you have the time, it's really worth digging into his work as he had a real eye for striking images that provide a lot of context for the situation he was in. He used to travel with very little besides a sleeping bag and camera so he often experienced the harsher side of life while on the job. At times his photos were smuggled out of the soviet borders, and published anonymously, to keep him safe. Check the link for a good starting point on Magnum's website!