Krejča and his work was banned following the Soviet invasion of Czechoslovakia in 1968, which ended a period of political liberalization known as the Prague Spring. The new Czechoslovakian government would not allow Krejča to work in the country; he was only allowed to work abroad. He went on to direct more than 40 theater productions, including in Austria, Italy, Belgium, France, Germany, Finland and Sweden. Krejča returned to work in his homeland following the fall of the Czechoslovakian Communist government in 1989. He received numerous Czech and foreign awards for his work.