The group, Organization of the Northeast says the plan would keep many neighborhood kids out of Senn and make it less diverse.
Smith has proposed turning the high school into four separate academies. Smith says only the college prep school would have selective enrollment. The others would accept any student living in the Senn community.
The group left a letter on Smith's door.
"We are tired of the alderman saying she wants to better the school. But who does she want to better the school for? She doesn't want to better it for everybody," said Brian Roa, Senn teacher.
"We really don't want Senn to turn into a place where you have to apply to get into it. It should be a community school that everyone in the community can go to," said Cassandra Chen, ONE supporter.
The group says they would like Smith to work with them on a plan for the school.