Gershom Ndhlovu explains [1] why it is a tough job being an opposition leader in Zambia:
It is really a tough job to be an opposition leader in Zambia. You have to daily face the police, risk being teargased or even locked for doing the job that you must do — meeting potential voters even when elections are five years away or performing the most important function, that of providing checks and balances. Opposition Members of Parliament are equally poached at will by the head of state.
If there is a cliché that applies in this situation is that of “history repeats itself.” The process of harassment, for that is what it is, tends to bake the leaders for when they take over government and apply the same methods to those who fall in the unfortunate role of being opposition leaders especially if they are popular.