A conservative activist who has caused problems for the community organizing group ACORN and the son of a federal prosecutor were among four people arrested and accused of trying to interfere with phones at U.S. Sen. Mary Landrieu’s office.

Activist James O’Keefe, 25, was already in Landrieu’s New Orleans office Monday when Robert Flanagan and Joseph Basel, both 24, showed up claiming to be telephone repairmen, according to U.S. Attorney Jim Letten’s office. Letten says O’Keefe recorded the two with his cell phone.

Federal officials did not say why the men wanted to interfere with Landrieu’s phones or whether they were successful. Landrieu, a moderate Democrat, declined comment Tuesday. She has been in the news recently because she negotiated an increase in Medicaid funds for her state before announcing her support for Senate health care legislation.

An FBI criminal complaint charging the men was unsealed Tuesday.

O’Keefe was the brains behind a series of undercover videos which have caused major problems for ACORN — the Association of Community Organizers for Reform Now.

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