Erlander Cabinet III 1957–1969
Tage Erlander's twelve-year third cabinet (31 October 1957 – 14 October 1969) — a Social Democratic single-party government, minority for most of its life and absolute majority after the 1968 election (SAP 50.1 percent). It carried the ATP supplementary-pension reform through the Riksdag in 1959 (115–115, Liberal MP Ture Königson abstaining), launched the Million Programme in 1965, executed Dagen H in 1967, agreed in 1967/1968 to abolish the bicameral Riksdag, and weathered the 1963 Wennerström espionage crisis before Erlander handed power to Olof Palme.
Erlander III was sworn in on 31 October 1957, two days after the King had asked Erlander to form a single-party SAP minority government following the red-green coalition‘s collapse over the supplementary-pension referendum. The cabinet ruled twelve years — the longest unbroken Swedish prime-ministership of the modern era — and bridged Sweden’s post-war “record years” with the institutional restructuring of the late 1960s.
Its first existential test came in 1958, when the supplementary-pension bill was defeated 117–111 in the Riksdag. Erlander called the third and last snap election in Swedish history; SAP won 46.2 percent, and in 1959 the ATP reform passed 115–115 when Liberal MP Ture Königson abstained. The 1960 election — SAP 47.79 percent — was, in Erlander’s own framing, an “ideological breakthrough.” From there the cabinet rolled out the long arc of Folkhemmet maturity: the Million Programme in 1965 (one million homes by 1974), Dagen H in 1967 (overnight switch to right-hand traffic), and the 1967/1968 multi-party agreement to abolish the bicameral Riksdag — the Första kammaren voted itself out of existence on 17 May 1968 by 117 to 13.
The cabinet’s largest crisis was the 1963 Wennerström affair, when Colonel Stig Wennerström was exposed as a Soviet spy after roughly fifteen years and around 160 Swedish defence secrets sold. Defence Minister Sven Andersson and Foreign Minister Östen Undén had been suspicious for years; Erlander, by his own account, was not informed until the day of arrest, while on holiday in Italy. The 1968 election delivered SAP an absolute majority of 50.1 percent. Erlander stepped down voluntarily on 1 October 1969 at age sixty-eight; the formal handover to his protégé Olof Palme was completed on 14 October 1969.