Three more present and former University security guards charged last week that supervisors mistreated them because they are minorities, bringing to six the number of guards who have made such allegations in the past month.

An Asian-American guard said last week a supervisor sexually harassed her in 1990, and a former guard said yesterday officials put him on probation because he is Black.

In addition, a Black security guard said last night that the department suspended him for sleeping on duty but only warned a white guard caught doing the same. The Black guard, Steven Thompson, questioned whether the University investigated the disciplinary discrepancy adequately.

"There's a lot of discrimination. We were always picked on," said Rodney Johnson, the former guard.

Johnson, now a guard at a local bank, said he saw racism in the discipline, promotion and day-to-day treatment of minority guards while he worked at Harvard between 1978 and 1988.

Assistant Director for Finance and Administration Brian D. Sinclair '62, who assists Harvard Police Chief Paul E. Johnson, denied the new charges last night, and emphasized that officials have investigated all six complaints. Johnson could not be reached for comment.

Sinclair said Thompson and a white guard were disciplined differently because the "circumstances were very different."

Sinclair also acknowledged that police officials last month called in and questioned a Black guard who told The Crimson that he had been racially harassed by two supervisors.

The guard, Pierre R. Voss, is on a disability leave, and police officials asked him only about his health during the meeting, Sinclair said.

The meeting--which both Sinclair and Johnson attended--occurred five days after Voss told The Crimson that Robert J. Dowling, manager of operations for security, and security supervisor Donald Behenna singled him out for verbal abuse because he is Black. Behenna singled him out for verbal abusebecause he is Black.

Dowling, who oversee the security guarddivision, also attended the meeting. He could totbe reached for comment.

In an interview yesterday, Voss accused thepolice department of using the meeting toretaliate for his public complaints.

Although Sinclair acknowledged that it wasunusual for Johnson and him to attend, hemaintained that the meeting was a routinedisciplined hearing. Voss was not disciplined atthe meeting.

Sinclair also said that police officialscontacted Voss' doctor to find out if he hadmissed any doctor's appointments while on leave.

Sinclair said the procedure was not unusual.

"We do this kind of thing with a lot ofgrievances and discipline you never see," he said.