"Attacks on judicial independence are attacks on the people," Friday Forum, a citizens group said in a statement.
"The judicial power of the people has to be exercised both independent of the political authorities and also without partiality.
"Otherwise we, as citizens, are left without equal protection of the law, particularly against violations of our democratic freedoms and rights by political authorities.
"We need to do all we can to safeguard judicial authority and independence.
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District Judge Manjula Tillakaratne head of Sri Lanka's Judicial Service Commission, was assaulted last week, following earlier attempts by the ruling political elite to intimidate the commission.
The JSC is one of the last remaining independent commissions of the country after a series of commissions were abolished by elected rulers by a change to the constitutions.
Recently a minister Rishad Bathiudeen became embroiled in a controversy over an attack on independence of the judiciary in th