The "Thatcher years" were also marked by periods of high unemployment and social unrest, and many critics on the left of the political spectrum fault her economic policies for the unemployment level; many of the areas affected by mass unemployment as well as her monetarist economic policies remained blighted for decades, by such social problems as drug abuse and family breakdown. Unemployment did not fall below its May 1979 level during her tenure, only marginally falling below its April 1979 level in 1990. The long-term effects of her policies on manufacturing remain contentious.