The imagery used in "Song of the Shirt" can reflect the conditions described in "Workers' Rights," because they show the hardships workers had to go through to ask for labor improvements.
We can arrive at this answer because:
"Song of the Shirt" features imagery in the very first stanza.
The imagery allows the reader to perceive the tiredness, poverty, dirt, and exploitation that workers were subjected to in the workplace.
This imagery continues to appear throughout the poem showing a negative feeling to the reader.
These imagery are related to the subject covered in "Workers' Rights."
"Workers' Rights" is the poem that shows workers' demands for better working conditions.
That's because the workers felt so damaged by the tiredness, dirt, exploitation, and poverty, which is shown in the imagery of "Song of the Shirt."
"Workers' Rights," however, does not describe the workers' struggle accurately, as it depicts this struggle in a very generalized way, presenting only the most generalized elements of that struggle.
