Want to Dig Deeper? 
Review these background references:

Understanding the Federal Courts- This publication is from the Administrative Office of the United States Courts. It provides an introduction to the federal justice system, including how it is organized and how it relates to the legislative and administrative branches of government.

Code of Conduct for U.S. Judges - This document includes the ethical principles that apply to federal judges and provides guidance on the official duties and engagements related to outside activities for federal judges. 

Congressional Research Service Paper: The Supreme Court Adopts a Code of Conduct - This document was published following the announcement of the US Supreme Court's adoption of the Code of Conduct and provides a legal sidebar with background information on federal judicial ethics rules before the adoption of the Code and briefly outlines the substance of the code adopted. 

Additional Recommended Reading:

The LWVUS Study Committee offers the following additional resources as recommended reading:

Americans Pass Judgment on Their Courts

CRS Supreme Court Appointments

Judge Broke Rules by Criticizing Justice Alito During Flag Flap - WSJ

Senate Democrats find many ethical lapses by Supreme Court justices - WAPO

The Federal Judicial Nominations Process

Federal Courts Won't Refer Clarence Thomas for DOJ Investigation