The vice chairman of the Massachusetts Republican Party was charged Tuesday with money laundering after he allegedly offered to “cleanse” drug proceeds for a legal client.

Lawrence Novak, 54, an attorney from Brockton, Ma., was arrested at his home Tuesday after investigators said he allegedly offered to launder drug profits for Scott Holyoke, who is awaiting trial on federal drug trafficking charges and agreed to be a cooperating witness against Novak for the FBI.