Federal authorities accused Philadelphia City Councilmember Kenyatta Johnson on Wednesday of illegally exploiting his elected office to advance his wife’s consulting career. In a 21-count indictment, prosecutors alleged that Johnson, 47, and his wife, Dawn Chavous, 40, pressured a nonprofit seeking his help with rezoning legislation into offering her a job in 2014. That charity — Universal Companies, a community developer and charter school operator founded by renowned music producer Kenny Gamble — employed Chavous as a consultant.