There is nothing strange about Jim Jones attracting African Americans. He was one himself and really pushed racial mixing.
This is the Wikipedia entry for jones personal life.
ones was born on May 13, 1931 in a rural area of Crete, Indiana[1][2] to James Thurman Jones (18871951), a World War I veteran, and Lynetta Putnam (19021977).[3][4] Jones was of Irish and Welsh descent;[5] he later claimed partial Cherokee ancestry through his mother, but his maternal second cousin stated that this was untrue.