Conversation so far:
What charities did philanthropist Doris Duke sponsor?
Doris Duke was active in preserving more than 80 historic buildings in Newport, Rhode Island.
Which buildings did Doris Duke help restore?
Historic properties include Rough Point, Samuel Whitehorne House, Prescott Farm, the Buloid-Perry House, the King's Arms Tavern, the Baptist Meetinghouse, and the Cotton House.
How much did Doris Duke pay for the restoration of historical buildings?
The nearly $22 million that Doris Duke donated to NRF represents the largest gift to any single organization in her lifetime.
Was Doris Duke involved with any other charities, besides the building restoration ones?
Doris Duke's first major philanthropic act was to establish Independent Aid, Inc.

Question: What did Independent Aid, Inc. do ?
Self-contained rewrite: What did Doris Duke's organization Independent Aid, Inc. do ?