Kuppet has seen its membership grow to 110,000, from 70,000 in 2018.
Mr Sossion faces stiff opposition from his national executive members, given the falling fortunes of Knut that are blamed on his leadership style.
The country’s two giant teachers’ unions go to the polls next year, with the Kenya Union of Post-Primary Education Teachers (Kuppet) boasting a larger membership for the first time.
After an exodus of members orchestrated by the Teachers Service Commission (TSC), the Kenya National Union of Teachers (Knut) goes to elections a weakened body, a development that undermines Secretary-General Wilson Sossion’s quest for a third term.
