Federal officials will review two deadly police shootings that sparked a fourth day of violent protests that left downtown business heaped with shattered glass and jails full of demonstrators.

Four police officers were arrested Tuesday by the FBI on charges that they used excessive force against undocumented immigrants and covered up abuses in New Haven, Connecticut.

The controversy over the federal immigration enforcement program known as Secure Communitieshas been brewing since not long after it was first implemented, and that makes it one of the top immigration stories of 2011.

A recent release by the FBI of their 2010 Hate Crime Statistics documenting how hate crimes against Latinos have jumped to 67 percent from 62 percent in 2009 underscores a simple fact -- this is not a random surge of violence.

According to documents, S-Comm is only the first of a number of biometric interoperability systems being brought online by the FBI’s "Next Generation Identification" (NGI) project. NGI will expand the FBI’s existing fingerprint database to add iris scans, palm prints, and facial recognition information for a wide range of people.

Documents released on Wednesday reveal more details about how the government planned to roll out its Secure Communities immigration-enforcement plan and confirm that the FBI plans to implement additional security programs in the next five years.

Following the arrest earlier this month of nationalist Norberto Gonzalez Claudio for his alleged involvement in the 1983 Wells Fargo robbery of $7.2 million, Puerto Rican independence activists on the island are saying that the FBI is conducting a new wave of intimidation.

A new report, released last week by New York University’s Center for Human Rights and Global Justice, documents cases in which law enforcement has used legally suspect policing practices that conjure imaginary terrorism plots, which are used to target and entrap Muslims living in the U.S.