In the years following the Second World War, populism was largely absent from Europe, in part due to the domination of elitist Marxism-Leninism in Eastern Europe and a desire to emphasise moderation among many West European political parties. However, over the coming decades, a number of right-wing populist parties emerged throughout the continent. These were largely isolated and mostly reflected a conservative agricultural backlash against the centralisation and politicisation of the agricultural sector then occurring. These included Guglielmo Giannini's Common Man's Front in 1940s Italy, Pierre Poujade's Union for the Defense of Tradesmen and Artisans in late 1950s France, Hendrik Koekoek's Farmers' Party of the 1960s Netherlands, and Mogens Glistrup's Progress Party of 1970s Denmark. Between the late 1960s and the early 1980s there also came a concerted populist critique of society from Europe's New Left, including from the new social movements and from the early Green parties. However it was only in the late 1990s, according to Mudde and Rovira Kaltwasser, that populism became "a relevant political force in Europe", one which could have a significant impact on mainstream politics.