"Call no chain strong, which holds one rusted link.
See in text (Protest)
The English proverb “A chain is only as strong as its weakest link” has provided a valuable metaphor throughout history. In this instance, Wilcox builds on the idea that a whole cannot be strong when one part is unhealthy. Notice though, that Wilcox says “rusted” instead of “weak.” Rust carries connotations of “forgotten” or “neglected,” and since Wilcox is saying that the marginalized and oppressed need to be heard, the implication being that the concerns of less privileged groups have historically been forgotten and neglected.