"Trickle down economics", aka the rise of unhindered monopolies and the stock market grift, was a complete scam, knowingly so.
He was an FBI informant.
He, arguably, embezzled money from SAG after using his FBI informant role to oust his rivals.
He started the war on drugs.
He reinforced the precedent that when an American president is debilitated, their spouse becomes defacto President.
He closed the asylums in California.
I could go on.