Here's more from Alliance for Justice (pdf):

[Alito has shown]limited appreciation for the rights of the accused. In one noteworthy dissent, he dismissed evidence of race discrimination by a prosecutor in jury selection. In another
opinion, he upheld a death sentence against a claim that the defendant’s counsel was constitutionally deficient. The Supreme Court reversed 5-4, with Justice O’Connor casting the deciding vote.

PFAW on a death pranlty case in which an opinion he wrote was reversed by his circuit en banc:

[Alito]Fails to consider racial discrimination in capital punishment: An African American had been convicted of felony murder by an all white jury from which black jurors had been impermissibly struck because of their race. Alito cast the deciding vote and wrote the majority opinion in a 2-1 ruling rejecting the defendant's claims. The full Third Circuit, in a split decision, reversed Alito's ruling, and the majority specifically criticized him for having compared statistical evidence about the prosecution's exclusion of blacks from juries in capital cases to an explanation of why a disproportionate number of recent U.S. Presidents have been left-handed. According to the majority, "[t]o suggest any comparability to the striking of jurors based on their race is to minimize the history of discrimination against prospective black jurors and black defendants . . ."

White Collar Crime Blog reports:

In another case familiar to those who follow white collar crime cases, he wrote the opinion in United States v. McDade, 28 F.3d 283 (3d Cir. 1994), that rejected then-Representative Joseph McDade's challenge to the government's RICO and corruption charges on the grounds that it violated the Speech or Debate Clause, holding that the government was not questioning the Congressman about his statements. The government's prosecution of McDade, and his subsequent acquittal, led to the adoption by Congress of the McDade Act, 28 U.S.C. Sec. 530B, which requires federal prosecutors to adhere to the professional responsibility rules of the state in which the attorney practices, and the Hyde Amendment, 18 U.S.C. Sec. 3006A Note, which permits an award of attorney's fees to a defendant who is a "prevailing party" in a prosecution.