District secretary Kainulainen evolved in the mid-1960s as one of the Communist Party's opposition main players. He strongly condemned any form of revisionism, which represented the majority party led by Aarne Saarinen. Kainulainen was a rhetorical man and easily conflict-prone. In the spring of 1968 he was sought to be dismissed from the SKP Political Committee. However, he survived with a warning. In the fall of 1968 Kainulainen supported the Occupation of Czechoslovakia, which on the other hand SKP condemned.[4] The Opposition Tiedonantaja magazine, originated from the Tiedote (Newsletter) magazine of the Uusimaa District, was founded by Kainulainen in the autumn of 1967. As the first editor-in-chief he recruited his faithful assistant Tauno Wallendahr. Kainulainen was a key figure in the process of turning it into a joint publication of the entire opposition in the autumn of 1968.