<iframe width="580" height="385" src="https://www.youtube.com/embed/VzZVD31ta_I" frameborder="0" allowfullscreen></iframe> <br>The Signal of Liberty was an anti-slavery paper published by Reverend Guy Beckley and Theodore Foster in Ann Arbor beginning ... <br><a href="https://www.youtube.com/watch?v=VzZVD31ta_I">source</a>