High Quality Content by WIKIPEDIA articles! Pacific Legal Foundation (PLF) is the first and oldest conservative/libertarian public interest law firm in the United States. PLF was established for the purpose of defending and promoting individual and economic freedom in the courts. To that end, PLF attorneys litigate, file amicus curiae briefs, and participate in administrative proceedings with the goal of supporting free enterprise, private property rights, reasonable environmental regulations, and the principle of limited government.