Such as?
I mean, he tried to implement the exact same policies the Heath Government later implemented with regards to Unions and introduced wage (and price) caps (although not the same caps that led to the power cuts). Given that Labour is supposed to be the party of, well, Labour it's not surprising people felt he betrayed the Left by attempting to betray workers at the time. It was also exaggerated, essentially, by his successors who wanted to reshape the party towards their ideological bent.
In his first term unemployment was fairly low. In his second term it rose from 1 million to 1.5 million. Under Thatcher it rose from 1.5 to 3 million and that's after she changed the accounting methods;
It went from 0.59% of GNP to 0.39%. He also introduced interest free loans to developing countries so I don't know if "seriously hurt them" is accurate...Thatcher's government implemented many measures meant to make it harder to claim benefit, and eventually began counting only those actually receiving benefits in unemployment figures, excluding those who had applied for benefits but had not yet begun receiving them, or who had been recognized as unemployed but denied benefit. as well as certain marginal categories of the unemployed such as men over 60, whether they received benefit or not.
It has been retrospectively estimated that the official measure for calculating the unemployment rate was changed at least 29 times between 1979 and 1989. Later in the decade, the government began instructing doctors with the National Health Service to find ways where they could to diagnose unemployed patients with illnesses or injuries resulting from their previous work so they could receive sickness or invalidity benefit and thus no longer be considered unemployed
He also implemented a stimulus, introduced new benefits, increased spending on benefits, food and housing subsidies and an increase in the state pension (on top of changes that linked it to earnings and benefited women). The real issue he was facing was devaluation which he eventually conceded (along with austerity, not trying to recover from a recession with austerity or austerity as a panacea that the Tories push).
Tony Benn was actually the one promoting a protectionist economy which Wilson rejected and later the cabinet did as well. Economic planning was the consensus of the day, not just a Labour position and a few of the industries served a national purpose, like shipbuilding.