Simplify the following text for a Grade 12 native English-speaking person.
Original: It grew out of the John Reed Club as an alternative to New Masses , the publication of the American Communist Party , but became staunchly anti-Communist after Joseph Stalin secured his place at the head of the Soviet Union .
Simplified: It grew out of the John Reed Club as an alternative to New Masses , the publication of the American Communist Party , but became anti-Communist after Stalin .