If They Knew They Were Slaves

SOURCE:  Unfortunately, this looks like one of those fabricated quotes.  

https://www.barrypopik.com/index.php/new_york_city/entry/i_freed_a_thousand_slaves#:~:text=American%20abolitionist%20Harriet%20Tubman%20%281822-1913%29%20is%20often%20credited,is%20no%20evidence%20that%20Tubman%20ever%20said%20this.

"I freed thousands of slaves.  I could have freed thousands more if they knew they were slaves."

--(falsely attributed to) Harriet Tubman