Two hours before Mayor Jim Hahn began his Tuesday news conference to state his opposition to Bernie Parks getting a second term as police chief, South Los Angeles activist Najee Ali was already reacting. He’d gone to the Los Angeles City Clerk’s Office to file papers to petition for the recall of Hahn.“No one has complained about Parks but the cops,’’ Ali said. “It’s all political. Hahn has caved in to the demands of the Police Protective League.’’ A recent poll among members of that union, which has long opposed Parks, found that more than 90 percent of the respondents opposed rehiring Parks this year for a second five-year term as chief. The PPL strongly supported Hahn for mayor, and Hahn has already delivered on his PPL- inspired campaign promise to shorten the LAPD work week.Ali became known last year when he publicly accused U.S. Representative Maxine Waters of being involved in his dismissal from the staff of a local community newspaper.