So, I was curious about the Molly Maguires after discussing them in class, and it turns out that Mr. Tantillo was right! According one website, the real Molly Maguire was a real person! The real Molly Maguire was an Irish widow who protested against thieving landlords in the 1840's. She led the "Anti-landlord Agitators" and she and her followers would fist fight with the corrupt landlords to "maintain their land and their dignity". Eventually, the Agitators grew famous in Ireland and adopted the name "Molly Maguires" after their infamous leader. The Irish immigration to America brought over Molly Maguires who became active again to fight for Irish coal miner's rights.
Here's the source if anybody's interested: