Which "new" type of film increasingly challenged the Production Code Administration well into the 1960s?

Name: Which "new" type of film increasingly challenged the Production Code Administration well into the 1960s?
Brand: Quizplus
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Question

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Foreign-made negative pickups increasingly challenged the Production Code Administration into the 1960s, as these films often contained content that pushed the boundaries of what was acceptable under the strict guidelines of the Code.

Which "New" Type of Film Increasingly Challenged the Production Code