Mangone had been the most
important cooperating witness to federal prosecutors in years, whose information helped put away three former GOP senators — Vincent Leibell, Tom Libous and Nick Spano.
The criminal complaint charging Seabrook and his fellow defendant, hedge - fund manager Murray Huberfeld, strongly suggests that a
witness who is
cooperating with the government in the case, Jona S. Rechnitz, could also serve as an
important witness in at least one of the fund - raising inquiries centered on NYC Mayor Bill de Blasio.