Final answer:
The statement is false. The 1960s did not mark the first growing wave of mass murder in the US.
Step-by-step explanation:
No, the statement is false. While the 1960s was a decade marked by significant social and political changes in the United States, including civil rights movements, anti-war protests, and assassinations of prominent leaders, it is not accurate to claim that it marked the first growing wave of mass murder in the US.