sentences:  Drees was an Esperantist and addressed the 1954 World Congress of Esperanto, which was held in Haarlem.A wide range of social reforms were carried out during Drees's tenure as Prime Minister.The Occupational Pensions Funds Act of March 1949 made membership of industry-wide pension funds compulsory, while the General Old Age Pensions Act of May 1956 introduced universal flat-rate old age pensions for all residents as a right and with no retirement condition at the age of 65.