Who is the antagonist of the novel The Broken Blade?

Nicky Cruz and David Wilkerson.

"The Cross and the Switchblade" tells the true story of Rev. David Wilkerson leaving Pennsylvania to minister to the youth involved in the street gangs of New York in the late 1950's and 1960's. One of those members of the street gangs was Nicky Cruz, who became a Christian and has his own evangelistic outreach ministry, Nicky Cruz Outreach.