NEW YORK -- Former SUNY Polytechnic Institute president Alain Kaloyeros' brusque personality earned him the nickname "AK-47" among executives of a Buffalo development firm where he allegedly steered a state contract, a former company official testified Tuesday.

Kevin Schuler, an ex-vice president at LPCiminelli revealed Kaloyeros' unflattering nickname -- a reference to an assault rifle that originated in the former Soviet Union -- during his third day on the witness stand in Kaloyeros' bid-rigging trial in U.S. District Court in Manhattan.

"Just how difficult he could be," Schuler testified.

Schuler said Kaloyeros was so rude on the phone during contract negotiations with the company in 2014, Michael Laipple, an executive with the firm, told Schuler he wanted to drive to Albany to confront the founder of SUNY Poly.

Kaloyeros, 62, more commonly known as "Dr. K," is on trial before Judge Valerie Caproni accused of rigging the bids for more than $850 million in SUNY-Poly related state contracts that were part of Gov. Andrew Cuomo's Buffalo Billion initiative. Kaloyeros' co-defendants include Louis Ciminelli, 62, the president of LPCiminelli, Steve Aiello, 60, president of COR Development in Syracuse and Joseph Gerardi, 58, COR's general counsel.

All are charged with wire fraud and conspiracy to commit wire fraud. Gerardi is also accused of lying to federal officers.

Schuler and Laipple (who has watched Schuler testify) were originally to be tried as well. Prosecutors dropped all charges against Laipple. Schuler pleaded guilty to wire fraud charges and is cooperating with the government.

On Tuesday, during cross-examination of Schuler, Kaloyeros defense attorney Reid Weingarten tried to show that Kaloyeros' at-times edgy relationships with Ciminelli's company illustrated there was no colluding to rig bids.

The lawyer showed emails in which future felon Todd Howe -- the ex-lobbyist who at the time was working as a consultant for both Kaloyeros' school and LPCiminelli -- did not include Kaloyeros in conversations with LPCiminelli executives.

After one tense moment in 2014 between Kaloyeros and LPCiminelli, Schuler emailed an associate saying, "We need to get Dr. K comfortable."

Weingarten, citing the exchange and posing the question skeptically, asked Schuler: "This is the person you're in a criminal conspiracy with?"

"Yes," Schuler answered.

Weingarten noted a March 4, 2014 exchange in which Kaloyeros complained about negotiations with LPCIminelli --and raised the issue of pulling out of a contract with them.

That January, the company had secured the bid for future Buffalo Billion-related contacts in Buffalo.

"I thought the deal was already cooked?" Weingarten asked Schuler, using a term for bid-rigging.

"We still needed to get a contract," Schuler replied. "We had the designation but no contract."

The contracts at issue were not project-specific but rather to become the preferred developer for future economic development projects in Syracuse and Buffalo.

Federal prosecutors have shown the jury emails that show Kaloyeros sent Louis Ciminelli a draft of an RFP (request for proposal) for the Buffalo project on Sept. 9, 2013, which was weeks before the RFP was published. It was also before the company even officially contacted the Fort Schuyler Management Corp., the non-profit board of SUNY Poly that approved the contacts, to express an interest.

Testimony has shown that Kaloyeros was at a dinner in Buffalo five days before with major local names -- including the president of the Buffalo Bills and publisher of the Buffalo News -- and Ciminelli.

And through Howe, the company was emailed a sneak preview of Cuomo's plan to develop the RiverBend site, former steel business site on the Buffalo River, into a major economic development project for two California companies. The area is now occupied by a SolarCity facility.

On Nov. 21, 2013, Cuomo announced plans to developing the area.

LPCiminelli officially submitted a bid for the Buffalo Billion RFP on Dec. 10, 2013. It won the bid in late January and later the right to redevelop the RiverBend site.