To accurately answer your question, I would need more context about "Ellen" and her specific interests or profession. However, based on the options you've provided:
- A general union typically represents a wide variety of workers across different industries and job types.
- A white-collar union specifically represents professional, office, or clerical workers.
Without additional context regarding Ellen's profession or the type of work she is interested in, I cannot definitively identify which union she wants to join. Could you provide more information about her situation or preferences?