The lobbyist in the second case is working on behalf of the labor unions, and will push for legislation to make it harder for employers not to hire workers who aren’t members. This lobbyist’s goal would be to get elected officials to pass laws that protect unionized workers by increasing wages, improving working conditions and providing better job security. They are both trying to influence the decision-makers in a way that benefits their clients directly while also minimizing any negative effects they might experience.
Both lobbyists are interested in advancing a particular cause, but they approach it from different angles depending on who represents them. The former wants to protect themselves from government interference and the latter is looking for greater protection through government intervention. This shows how diverse this profession actually can be at times.