The school district interviewed many substitute teacher candidates the Sunday before the strike started. Meanwhile, Strongsville teachers picketed outside.
Christine Canning speaks for the Strongsville Education Association. She says people who applied for those substitute jobs won't get union support in the future.
CANNING: "Anyone who had applied for the jobs, and then would be interested again in subbing, of course we would not be comfortable having them sub in our classrooms..."
CASTELE: "What would be the reason for that?"
CANNING: "Because they have crossed the line. And they went into our rooms and didn't support what the vision was of our union at this point in time."
Sally Klingel is an expert in labor-management relations at Cornell University. She says this tactic of enforcing unity helps unions maintain their position at the negotiating table.
KLINGEL: "A union garners some of its power -- a large portion of its power -- from its ability to stick together and to speak with one voice."
And that means not sending mixed messages.
A posting for the substitute job online says pay is $175 a day. It looks like substitutes will have these jobs for the near future. When the district and union met Wednesday, they didn't reach an agreement.