Prohibit congressmen/women employment with special interest groups/lobbyist four years prior/post their term in office

Many lawmakers & lobbyists play the government/corporate musical-chairs dance. Frequently our "democratically"-appointed reps go on to receive multi-million dollar salaries for companies/lobbying firms once their term is over, sometimes slipping special-interest group language into a bill in order to get their big pay out later. Perhaps they've already tried their hand in the public sector & are ready to further their group's cause further by becoming an active member of congress with incentives. Perhaps they are active lawmakers or government officials WHILE on the Board of Directors. This major conflict of interest doesn't serve the American public, it serves corporations/ special interests. Ban congressmen/lobbyists for 4 yrs pre/post term from the revolving- door behavior.