Best results start with smart searching.
Spell names and terms accurately - double check the spelling of your progressive's name before searching.
Use quotation marks arround full names or phrases to search for them as a complete unit. For example, "Jane Addams" or "Hull House."
Use Boolean operators - AND, OR, NOT - to refine your search. For example, "Upton Sinclair" AND meatpacking will narrow results to sources that include both terms.