Jesus Friend of Terrorists, by Richard Wurmbrand, is a 100 page book addressing the concerns of those within Marxist thought and inviting them to a relationship with God.
These Are Also Your Brothers
Christ on the Jewish Path
The Torchlighters: The Adoniram and Ann Judson Story
The Triumphant Church
The Witnesses Trilogy: God With Us
The Torchlighters: The Amy Carmichael Story