The president of the Compton Community College Board of Trustees has been arrested on suspicion of soliciting and accepting a $500 bribe in exchange for his favorable vote at a recent board meeting, the Los Angeles County district attorney's office said. Carl E. Robinson Sr., 50, a longtime civic activist in Compton and Carson, was arrested by a district attorney's investigator Thursday in the parking lot of a Wilmington restaurant after he allegedly accepted a bribe he had requested, a district attorney's spokesman said. Robinson, a U.S. Postal Service employee who lives in Carson, is free on $3,000 bail. He denied soliciting or accepting a bribe.