I don’t think you have to go too deep into kickback allegations to find some really high profile cases. Take this case with Senator Robert Menendez and his Floridian eye doctor associate.

http://www.businessinsider.com/bob-menendez-defense-fund-took-money-from-developer-jailed-for-kickbacks-2015-4

Where Senator Menendez was indicted on 14 counts of using his influence to help a Florida eye doctor in exchange for lavish vacations, campaign donations, etc.