As reported by Common Cause and Bob Edgar:

[T]hree members of our Supreme Court were guests last Thursday at an annual fundraising dinner sponsored by the Federalist Society, a self-styled association of conservative and libertarian lawyers that is providing much of the intellectual firepower behind efforts to overturn the landmark health care reform law passed last year.

Justices Antonin Scalia and Clarence Thomas were honorees and speakers at the black tie event and Justice Samuel Alito, a regular at Federalist Society gatherings, was in the audience, according to a program prepared for the dinner.

Edgar anticipates the question of whether this activity is ethically acceptable. The quick answer is that justices on the United States Supreme Court are not subject to any code of ethics:

[This activity] clearly violates the Code of Conduct for U.S. Judges, a set of ethical standards the Supreme Court helps enforce on lower federal courts but has refused to impose on itself.