Not only did the US turn a blind eye to the White Terror, but they were positively gleeful about it, as a key target of it was of course not only indigeneous-politics based, but fundamentally anti-communist.

Indeed a basic presupposition of the US providing you such extensive economic support, as a forward base in Asia against communism, is that you crush any opposition to its 'proper' functioning as such an economic and military asset. That supposes that you will crush any radical, labor, trade-union, let alone explicitly socialist or communist activity which appears to challenge the state.