Former English football player and BBC presenter Gary Lineker outside his home in London on March 12.HENRY NICHOLLS/Reuters The BBC is facing an unprecedented staff mutiny and allegations it stifled free speech after managers suspended top sportscaster Gary Lineker for criticizing the government’s new migration policy. The British broadcaster is best known for its global news coverage but on weekends it devotes much of its television and radio schedule to sports. Nearly all of that programming – including half a dozen shows and hours of soccer coverage – had to be cancelled or stripped down this weekend because dozens of...