[lelio]

Former Ullico Chairman and Chief Executive Robert Georgine invoked his constitutional right not to testify at a hearing
You don't have a "constitutional right not to testify" in general, but only for your own crimes.
As for testifying before Congress I'm not sure.

[Bayou City]

Snip from my original post from 2/9/02:
McAuliffe, chairman of a record-breaking Democratic fundraiser in May and chairman of recent Democratic convention in Los Angeles, has long been associated with organized labor. In addition to his work on the Union Privileges "affinity" credit card, McAuliffe has had a major role handling investments for the AFL-CIO Union Labor Life Insurance Company (ULLICO).
A Link To Global Crossing, Terry McAuliffe anf AFL-CIO