BALTIMORE, AUG. 13 -- The owner of a Baltimore area employment agency has been indicted on charges of unlawfully bringing Trinidadian women into the United States to be nannies in the Washington-Baltimore area.

Samuel Kaplan, 58, of Pikesville, was charged with conspiracy in an alleged two-year scheme in which, federal prosecutors said, women entered this country from the Caribbean island of Trinidad under the guise of "vacationing," paid Kaplan $2,000 to $2,500 each and were placed with families seeking nannies. Prosecutors said the scheme lasted until 1989.

Prosecutors would not say how many women were involved, but court sources indicate that there were several hundred. Another source said the women generally worked for $25 to $50 less per week than their American counterparts.

Three Trinidadian nationals, all men, also were charged. According to prosecutors, Kaplan solicited potential employers seeking live-in help and contacted the Trinidadian men, who in turn found women willing to come to the United States.

Maryland U.S. Attorney Breckinridge L. Willcox said the three men are thought to be in Trinidad now and cannot be extradited for trial here under the present U.S. extradition treaty with Trinidad and Tobago.

Kaplan could not be reached for comment. His attorney, Charles G. Bernstein, said Kaplan's business, Select Employment Services Inc., in Pikesville, has been a "family business for 50 years and never had any problems with regulatory agencies or any other kind of {legal} problem."

He said that when U.S. Immigration and Naturalization Service agents searched Kaplan's office before the indictment, "they acted like a bunch of Nazis and took every piece of paper he had . . . . There are some serious Fourth Amendment {search and seizure} issues in this case."

In addition to conspiracy, Kaplan is charged with six counts of inducing an alien to enter the U.S. unlawfully and additional counts of referring illegal aliens for employment for a fee. If convicted, he could face up to 35 1/2 years in prison and more than $1.75 million in fines.