1970's Drama / spies/ Detective style Movie

Ha ha! Do you remember when we were young and filled with curiosity and mischievousness? There's this movie with a great plot that I need help remembering the name of. I'm sure you know the answer. Can you help me out? 😀

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I didn't modify the title, as it has been there since I posted it. No, I can't recall the names of the actors or actresses, but it should be easier to track down. I'm pretty sure some of them are well-known today. Unfortunately, all I remember is the plot. Let me elaborate a bit on the plot: there was a scene where a blonde woman was killed with an airplane wing pin. The villain pinned the airplane wing on her chest, and she died. It was a unique way of capturing the audience's attention.