article_snippet: Allegations that a secret undercover police unit carried out spying operations on Labour MPs need to be investigated immediately,  
article_snippet: The revelations prompted demands for a forthcoming public inquiry into undercover policy to be widened to include the new allegations.
article_snippet: I know there's an inquiry into undercover police tactics and
article_snippet: A secret undercover police unit carried out spying operations on now deputy Labour leader Harriet Harman (left) and former foreign secretary Jack Straw .
highlights_snippet: A former officer from a secret police unit admitted spying on Labour MPs .
  
highlights_snippet: Deputy Prime Minister said  a probe into police tactics to investigate police tactics .