The stated purpose of this conference:"Racial unity is a gospel issue and all the more urgent 50 years after Martin Luther King Jr.’s death....The 50th anniversary of King’s tragic death marks an opportunity for Christians to reflect on the state of racial unity in the church and the culture. It creates the occasion to reflect on where Christians have been and look ahead to where we must go as we pursue racial unity in the midst of tremendous tension."
The problem not only is the Marxist Black Liberation Theology, but also that MLK was not a Christian. Public papers by MLK are here.
Basically, MLK denied Jesus' deity, His resurrection, a literal interpretation of Scripture, and a time he he realized he was a sinner in need of salvation by Christ Jesus alone apart from any works of his own (conversion).
In his own words, MLK said of Jesus Christ and the issue of His "divinity":
Here are some helpful quotes from Anthony Bradley's article "The Marxist roots of black liberation theology":