Political Levy
It is true that Unite is a major donor to Labour Party funds. That comes mostly from the Political Levy that is taken from each member's contribution. What is not well known, and the Unions do not advertise, is that each member has the right to allocate exactly where their Political Levy is sent. You can opt for it to go to another political party, or to a charity of your choosing. There is an appropriate form to be filled out and signed and your union rep must, by law, supply them on demand.