"source of information from people who were participants or direct witnesses to the events in question." like a reporter...
What is an archive?
Plural noun: archives
A collection of historical documents or records providing information about a place, institution, or group of people.
Which archive has the records you need?
Sometimes a whole archive will be devoted to one issue but many times an archive will own many collections. So how do you find archive materials when you don't know where to search?
TIP: You most likely won’t have the time or the ability to visit various archives in person so filter your search results to "digitized records" only.
Was your movement opposing or reacting to legislature? Were they trying to pass legislature? Try to find the government documents discuss the topic, locate statements made by politics involved on both sides of the issue...