I think the guy in the middle is Brother Booker T. Ashe. The mural is on the East side of the The House of Peace, Brother Booker T Ashe Center and he looks like the guy on the cover of this book.

"A biography of America's premier Black monk, aka Milwaukee's Ghetto Friar Tuck. Brother Booker Ashe was many things to many people - a civil rights leader, an inner city icon, a famous clergyman, a community organizer, a national Black celebrity, a civic cornerstone, a chef, a theater buff, and a brother to all. Talented, charismatic, dynamic and multifaceted - everyone who met the man has a different story to tell."

https://www.amazon.com/Brother-Booker-Ashe-Amazing-What/dp/1980368473