A grand jury indicted Kannah in 2012. The indictment remained sealed until his arrest last month.
Kannah appeared in federal court in Rochester on Jan. 31, records show. He has returned to Pennsylvania on $25,000 bail, and had to surrender his passport.
Boley was deported to Liberia in 2012 after the immigration judge found he had committed atrocities during the civil war, and went into battle with armed child soldiers.
Boley and his family maintained his innocence, while Liberia's Truth and Reconciliation Commission recommended that he be prosecuted for killings committed by the LPC while under his leadership.
The commission was formed to try to determine who was responsible for savage killings and sexual assaults of civilians during the civil war. While Boley has returned to Liberia, he apparently has not been prosecuted there for any alleged offense.
Boley had lived in Clarkson for several decades before his immigration arrest in 2010.