In August 1968, Jaruzelski, as the defence minister, ordered the 2nd Army under General Florian Siwicki (of the "LWP") to invade Czechoslovakia, resulting in military occupation of northern Czechoslovakia until 11 November 1968 when under his orders and agreements with the Soviet Union his Polish troops were withdrawn and replaced by the Soviet Army. In 1970, he was involved in the successful plot against Władysław Gomułka, which led to the appointment of Edward Gierek as General Secretary of the Polish United Workers Party. There is some question whether he took part in organising the brutal suppression of striking workers; or whether his orders to the Communist military led to massacres in the coastal cities of Gdańsk, Gdynia, Elbląg and Szczecin. As Minister of Defense, General Jaruzelski was ultimately responsible for 27,000 troops used against unarmed civilians. He claims that he was circumvented, which is why he never apologised for his involvement, but he could have resigned, especially after the resignation of foreign minister Adam Rapacki, but did not. Jaruzelski became a candidate member for the Politburo of the Polish United Workers' Party, the chief executive body of the party, obtaining full membership the following year.