WASHINGTON (AP) — The Supreme Court will consider limiting the power of government employee unions to collect fees from non-members in a case that labor officials say could threaten membership and further weaken union clout.The justices said Tuesday they will hear an appeal from a group of California teachers who say it violates their First Amendment rights to have to pay any fees if they disagree with a union's positions and don't want to join it.The teachers want the court to overturn a 38-year-old legal precedent that said unions can require non-members to pay for bargaining costs as long as the fees don't go toward political purposes.