article_snippet: A leading economist is to step down as executive chairman of an influential City think-tank amid drug abuse allegations.
article_snippet: Professor Douglas McWilliams, 63, revealed last night that A leading economist is to leave A leading economist role at the Centre for Economic and Business Research after footage emerged of A leading economist allegedly smoking crack cocaine in a north London drug den.
article_snippet: The think-tank, which A leading economist founded in 1992, confirmed A leading economist will take a five-month sabbatical.
highlights_snippet: Witnesses claim Top economist has been a regular at various drug dens for months .
  