This randomized controlled trial evaluated a culturally representative parent engagement strategy with Latino parents of elementary school children. Ten urban schools serving low-income children from mixed cultural backgrounds participated in a large study. Classrooms were randomly assigned either either to an after-school, multifamily support group (FAST: Families and Schools Together) or to receive eight behavioral parenting pamphlets with active follow-up (FAME: Family Education). Of 180 Latino parents assigned to FAST, 90 percent came once and 85 percent graduated. Two-year follow-up teacher data were collected for 130 Latino children. The teachers, blind to condition, evaluated the children's classroom functioning. Data were analyzed with hierarchical linear modeling, using a conservative, intent-to-treat model. On standardized mental health instruments (Teacher's Report Form of the Child Behavior Checklist; Social Skills Rating System), statistically significant differences favored assignment to FAST rather than to FAME on academic performance and classroom behaviors, including aggression and social skills.