Section 124A, he said, offended the fundamental right of freedom of speech and used as "weapon of oppression across the country from Bastar to university campuses".
Addressing mediapersons at an event by People's Union For Civil Liberties, a human rights body, he said the sedition laws are of British era which were framed to serve a purpose under the foreign rule but the same continue even now.
Urging all to unite to pressurise the government to repeal sedition laws and Armed Forces Special Power Act (AFSPA), Sachar said in the past major leaders had spoken against sedition laws but nothing happened as human rights do not find much importance in the political parties' agenda.
Reacting to his much-debated Sachar Committee report on minorities, he said its implementation by Union and state governments remains unsatisfactory.
"I do not have data on implementation and impact but I am not satisfied with all the consecutive governments, be it at Centre or in the states," he added.