Raymond Luc Levasseur, under investigation since 1976 in connection with bombings in New England and listed as one of the FBI's 10 most wanted fugitives, was arrested yesterday in Deerfield, Ohio, FBI Director William H. Webster announced. Four other fugitives also were arrested in Ohio.

Levasseur, 38, along with Thomas William Manning and Carol Ann Manning, has been identified as a member of the Sam Melville-Jonathan Jackson unit that allegedly has financed its activities through violent crimes, including bank robberies, Webster said. He added that the Mannings remain at large.

Levasseur was sought for bank robbery and unlawful flight to avoid prosecution on charges of unlawful possession of a weapon.

Webster said Patricia Gros, also arrested in Deerfield, is being charged with harboring Levasseur, identified as her common-law husband.

The three fugitives arrested in Cleveland were identified as Jaan Karl Laaman, 36, Richard Charles Williams, 37, and Barbara J. Curzi.

Webster said Laaman is wanted in connection with a shootout with Massachusetts state troopers in 1982; Williams is wanted in connection with the killing of a New Jersey state trooper in 1981; Curzi is accused of harboring a fugitive.

Webster said Levasseur and Thomas Manning are also wanted for questioning in connection with the 1981 murder of a New Jersey state trooper.