LOS ANGELES – School got off to a rough start Thursday with students returning to class for the first time since their entire elementary school staff was replaced after two longtime teachers were accused of lewd acts on children.

The teachers union president assailed the reassignment of teachers as a stunt, about 100 parents and students blasted the move, and some of the new teachers needed a bit of help from their charges.

United Teachers Los Angeles President Warren Fletcher said teachers were being “tarred and stigmatized for no reason” and that grievances would be filed against the Los Angeles Unified School District on behalf of some 85 reassigned teachers.

“It is crystal clear that LAUSD doesn’t have a plan,” Fletcher said. “They’re making this up as they go along, and students at the school are paying the price.”

The school had been closed for two days while the entire 120-member staff was replaced in an unprecedented move by the district.

Superintendent John Deasy said the makeover was needed to clear the school from a cloud of distrust and suspicion stemming from the arrest of former third-grade teacher Mark Berndt, 61, who has been charged with 23 counts of lewd acts upon children, ages 6 to 10.

A second teacher, Martin Springer, 49, was arrested last week after two girls said he had fondled them in class in 2009. Springer pleaded not guilty after he was charged with committing three lewd acts on one girl in 2009. The other girl has since recanted her allegation.

About 100 parents and children protested with signs saying “Give us our teachers back” and chanting “no new teachers.” Parents also attended a meeting with the new principal, but many emerged dissatisfied.

Deasy said replacing the staff, from janitors to principal, was necessary to restore trust among parents in the largely poor, Latino neighborhood of unincorporated Los Angeles County.