Margaret Thatcher, Lech Walesa, and Vaclav Havel all performed important supporting roles.
Margaret Thatcher, Lech Walsea and Vaclav Havel were terrible actors in the movie. 
mnli hypothesis: Margaret Thatcher, Lech Walsea and Vaclav Havel were terrible actors in the movie.  premise: Margaret Thatcher, Lech Walesa, and Vaclav Havel all performed important supporting roles.