Lecturers and supporters will march in defence of sacked trade unionists in Halesowen in the West Midlands on Saturday.
Halesowen College bosses sacked four maths lecturers who were active in the University and College Union (UCU)
The college said they were sacked because of students' low performance. But UCU said: "All four teachers had good records and it was the college's failings and selective use of information that allowed them to get rid of the staff."
UCU head of further education Barry Lovejoy said: "Halesowen College seems determined to pick fights with us at every turn.
"While it sacks union members and threatens others, its standing within educational circuits continues to plummet.
"It is difficult not to see this as an attack on trade union members, rather than anything that resembles fairness."
The demonstration assembles at the college at 9.30am.
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