As far as poor Latinos are concerned, I didn't notice many Muslims when I worked with a youth education program in Chicago that was 80% Mexican-American. They probably have more success with Puerto Ricans and Dominicans, many of whom are indistinguishible from blacks.
I have been teaching in an inner city high school in south Florida for about six years now, and let me tell you, these areas are RIPE for recruitment by radical islamists to their cause. The kids who are not already active in their Church (that's the ones in fragmented families or without a strong maternal presence in the home) are at significant risk.
These kids are easily manipulated and led. Most show a proclivity for violence and most hold an viewpoint of whites and republicans that is erroneous at the least and hate filled at the worst. Life on their street is violent and filled with gangs and drugs. ANYBODY who comes along and offers them a chance to "make a difference foir the black man" is going to find it the happy hunting ground.
I have warned local and state officials and have gotten a fairly decent reception for the most part from some law enforcement I have spoken with on this matter.