The following are some of the principal groups seeking to influence U.S. policy and public opinion on Central America. Description of funding is based on groups' own information.

American Institute for Free Labor Development: Sponsored by the AFL-CIO and funded largely by the U.S. Agency for International Development; provides technical advice to the peasant group supporting the land reform in El Salvador. While critical of official abuses against peasants, AIFLD is supportive of civilian elements in the Salvadoran coalition government and backs upcoming elections there.

Amnesty International: London-based human rights organization funded by individual donations; investigates and condemns rights violations by governments of all political orientations; has issued reports alleging human rights abuses by Guatemalan and Salvadoran armed forces.

Association of American Chambers of Commerce in Latin America: Made up of 19 chambers of commerce in the region; generally conservative and supportive of the region's governments.

Caribbean-Central America Action: Organization of more than 50 U.S. companies that works, with State Department support, to "strengthen the private sectors" in the region and encourage contacts with businesses in the United States.

Central America Working Group: Promotes conservative views by sponsoring visits of Central Americans to the United States, lobbying and writing articles. The group uses the office of the Inter-American Security Council and relies mainly on volunteer workers.

Coalition for a New Foreign and Military Policy: Made up of 49 church, labor and "social action" organizations "working for a peaceful, noninterventionalist and demilitarized U.S. foreign policy"; provides a Washington office for groups around the country; monitors U.S. policy-making and helps local groups organize political activity to influence policy-makers; funded by donations from local affiliates and individual members, sale of literature and "a broad array of foundations."

Collegiate Association for the Research of Principles: The youth organization of the Unification Church; organizes demonstrations and distributes publications supporting Reagan administration policies; receives funding from members and the church and relies heavily on volunteer work by members.

Committee in Solidarity With the People of El Salvador: Federation of about 300 local organizations supporting the Salvadoran opposition through demonstrations, teach-ins and publications; active on university campuses; supported by individual contributions and foundation grants.

Center for Strategic and International Studies of Georgetown University: Sponsors publications and seminars on foreign policy issues; funded by donations from individuals, corporations and foundations, with less than 5 percent of its income coming from contracts for technical government studies.

Council for Inter-American Security: Research and educational organization "specializing in hemispheric defense and security issues"; supportive of current policy. The council, which includes many retired military officers among its advisers, is funded primarily through direct mail solicitations, an official said.

Council of the Americas: Organization funded by 200 member corporations with interests in Latin America; provides information to its members and recommendations on Latin America policy to the government.

Council on Hemispheric Affairs: Sponsored by unions, professional and academic groups to counter the influence of large corporations and banks on policy toward Latin America; funded by two small family foundations and the sponsoring organizations; generally opposes administration policy.

Heritage Foundation: Puts out policy papers and other publications from a conservative point of view; funded by individual contributions, corporate donations and foundation grants.

Hudson Institute: 20-year-old conservative-oriented think tank supported by contracts from governments and businesses and foundation grants. About one-third of its income is from government defense contracts, according to a report issued by the institute last year.

Institute for Policy Studies: Washington-based research and educational organization opposed to U.S. policy; funded mostly by small grants from individuals and foundations and a larger grant from the Sam Rubin Foundation.

Institute on Religion and Democracy: Formed recently to promote a more conservative foreign policy view within the Catholic and Protestant churches; funded by foundations and in the process of soliciting a wider group of contributors; directs most of its material to clergy and prominent lay people.

Inter-Religious Task Force: Ecumenical organization providing assistance to church groups working against Reagan administration policy.

National Network in Solidarity With the Nicaraguan People: Disseminates material supporting the new revolutionary Nicaraguan government and opposing Reagan administration policy; funded by contributions from about 60 local groups, churches, the Stern Fund and other foundations.

Network in Solidarity With the People of Guatemala: Supports demonstrations and other activities in opposition to administration policy and disseminates information in support of groups seeking to overthrow the government of Guatemala; funded by private contributions and the dues of local chapters.

Religious Task Force: Funded by Catholic religious orders; provides information to church-supported groups working to influence U.S. policy.

Washington Office on Latin America: Church-funded; monitors the policy-making process in Washington and helps Latin American opposition figures make their views known in the United States.