To understand who the ILGWU were,
Just before the statement that showed amazement and positive acknowledgment of the protest made by the women, the author stated that the union men were amazed. Since this statement was coming from an ILGWU official, we can deduce that this group was made up of the 'union men'.
Context clues are helpful in answering questions like this. A reader should carefully note the preceding and following details to arrive at a conclusion.
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