Nonprofits dedicated to immigration often have four areas of focus: changing legislation, employment, education, and essential services. Controversies in immigration arise when considering what forms of immigration are considered illegal, and the perceived harms of allowing many immigrants into the U.S. without restriction, vs the severe dangers that many restrictions impose on such immigrants, especially potential refugees. These controversies lead to fighting pertaining to legislation, whether to make it harder for immigrants to legally immigrate to the United States or easier to do so, fighting involving employment, whether they deserve to find jobs in a country that is not necessarily theirs, and fighting over their rights to education and healthcare.

Resources and projects of interest for Immigration:

The ACLU Immigrant Rights Project uses litigation, advocacy, and public outreach to expand and enforce the civil liberties and civil rights of immigrants and to combating public and private discrimination against them. 

Catholic Charities -- Refugee and Immigration Services provides immigrants with education, employment, and housing through modest apartments furnished with basic necessities and assistance with acculturation, job placement services and English language training.

Cabrini Immigrant Services Cabrini Immigrant Services focuses on healthcare and other essential services through uniting families, protecting the vulnerable including children and victims of domestic violence, helping members access benefits like healthcare and food stamps.
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Resources and projects of interest against Immigration:

The Federation of American Immigration Reform is a non-partisan, public interest organization that is devoted to  changing legislation and educating the public on their beliefs on immigration and its drawbacks, in an effort to reduce all forms of immigration.

Negative Population Growth uses statistics concerning population growth, climate change, and sustainability to support their belief that legislation should be changed to reduce all forms of immigration. 
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NumbersUSA is an Education & Research Foundation that provides a civil forum for Americans concerning the numerical level of U.S. immigration. They strive to educate opinion leaders, policymakers and the public on immigration legislation and policies and promote reducing immigration numbers.