A man and a woman who are holding a sign 'Maritime workers say stop black deaths in custody' doesn't necessarily mean they are part of a union strike.


Context: A black man and a white woman, both wearing maroon shirts, are holding a sign between them that reads "Maritime workers say stop black deaths in custody" in all caps.
Hypothesis: They are part of a union strike, and are protesting.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?