句中 above criticism 可视为习语，其中的名词前不用限定词，其意为“无可非议”“无可指责”“无可批评”（above 在此的意思是“超出…所及；不受…的影响”。句意：
His action, which arose from his concern for the welfare of the commune members, is above criticism. 他的行为出于他对社员福利的关心，这是无可批评的。
又如：
His conduct is above criticism. 他的行为无可非议。
This book is above criticism. 这本书无可指责。
His character and abilities were above criticism. 他的品性和能力无可指责。
The article is well-knitted and original in its subject matter, so it is above criticism. 该文章结构严谨，题材新颖，所以无可批评。
类似的表达有above questioning（毋庸置疑），above reproach（无可指责），above suspicion（无可怀疑）等。如：
He wrote a reference for him, describing his reliability and trustworthiness as “above questioning”. 他为他写了封推荐信，称他为人可靠与值得信赖这两点是“毋庸置疑的”。
Her manners are above reproach. 她的举止无可非议。
Nobody who was near the scene of the crime is above suspicion. 犯罪现场附近的任何人都不能排除嫌疑。
