“We do not have to invade the United States, we will destroy you from within”, a quote often attributed to former Soviet leader Nikita Khrushchev. As is often the case about controversial historical figures, quotes attributed to them may or may not have actually been uttered exactly as recorded in history, perceptions and memories often differ or fade.
What is certain though is that efforts to undermine, or even overthrow the government of the United States by the Soviet Union were ongoing throughout the Cold War. The Soviets have tried to influence and outright interfere in every election the United States has conducted since at least the end of World War II. In fact the Soviet Union attempted to make inroads into all segments of American society in their ultimate goal of turning America into a communist nation.
Our colleges and universities became a prime target. If you can influence young, impressionable minds through feeding them a steady stream of communist doctrine, and turn them into mindless and good little socialists and communists, then they will become willing soldiers to carry out your wishes.