Kammala wannan jumla: Kryl ya koma Prague a 1968 a matsayin mataimaki a gidan talabijin na Czechoslovak. A cikin lokacinsa na kyauta ya yi waƙoƙin waƙoƙin soyayya da na ban dariya a cikin ƙananan ƙungiyoyi da yawa. Lokacin da sojojin Warsaw Pact
An mamaye Czechoslovakia a ranar 21 ga Agusta 1968 don murkushe motsi na gyaran Prague Spring, Kryl ya fitar da kundin waƙarsa ta farko. Waƙar taken "Bratříčku zavírej vrátka" ("Ka rufe ƙofar, Ƙananan Brotheran'uwa") an tsara shi ne da kansa a ranar 22 ga Agusta 1968 a matsayin martani na gaggawa ga mamayar. Kundin ya bayyana yadda yake kallon rashin mutuntaka na mulkin da ra'ayinsa game da rayuwa a karkashin mulkin kwaminisanci. Kundin, wanda aka fitar a farkon 1969, an hana shi kuma an cire shi daga ɗakunan ajiya ba da daɗewa ba, amma wannan ba zai iya hana waƙoƙin daga kewayawa a cikin masu sauraro ba kuma ya zama abin bauta.