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group Group theory required for further study in Von von Neumann algebra

After over half a year's study on operator algebra(especially algebra (especially on Von von Neumann algebra) by doing exercises in Fundamentals of the theory of operator algebras 1,2--Kadison1, 2 --Kadison, I was told that the current research focus is on the Ⅱ1 factor, and certain background on group theory is necessary, such as studying the free product, specific group construction and the ergodic action. Then, I want to know are there any good books on the group theory that might be necessary for further study on Von von Neumann theory?

show/hide this revision's text 1

group theory required for further study in Von Neumann algebra

After over half a year's study on operator algebra(especially on Von Neumann algebra) by doing exercises in Fundamentals of the theory of operator algebras 1,2--Kadison, I was told that the current research focus is on the Ⅱ1 factor, and certain background on group theory is necessary, such as studying the free product, specific group construction and the ergodic action. Then, I want to know are there any good books on the group theory that might be necessary for further study on Von Neumann theory?