ICP was founded as an institution to keep the legacy of "Concerned Photography" alive. After the untimely deaths of his brother Robert Capa and his colleagues Werner Bischof, Chim (David Seymour), and Dan Weiner in the 1950s, Capa saw the need to keep their humanitarian documentary work in the public eye. In 1966 he founded the International Fund for Concerned Photography. By 1974 the Fund needed a home, and the International Center of Photography was created.
Source: https://en.wikipedia.org/wiki/International_Center_of_Photography