Believing that dance can and should be more than a form of visual entertainment, Anna Sokolow, who died in 2000, was a modern dance pioneer. And her choreography is hailed for its social commitment and searing depictions of urban loneliness. Zeroing in on society’s vulnerable, her signature passages were of dancers hopelessly running in place, silently screaming, staring confrontationally at the audience and, suddenly, painfully falling to the ground. Highlighting these emotional aspects of her work, the Sokolow Theatre/Dance Ensemble presents several of her most intense pieces, including 1961’s “Dreams,” a work spun from Sokolow’s own nightmares about the Holocaust. The Times called it “one of the most shattering and the most impressive of contemporary dance theater.”