WASHINGTON — A one-time congressional aide who went on to work with a jailed lobbyist, Jack Abramoff, was arrested yesterday and accused of conspiring to corrupt government officials including his former boss, Rep. John Doolittle, a Republican of California.

Kevin Ring, 37, pleaded not guilty to a 10-count federal indictment that accuses him of conspiring with Abramoff to win assistance from congressional and executive-branch officials by giving them things of value, and helping them skirt requirements to report those gifts.

He appeared in federal court unshaven, his hair rumpled, wearing shorts and a T-shirt, and occasionally fighting back tears as he exchanged glances with his wife.

The indictment accuses Mr. Ring of obstructing justice by attempting to thwart a grand jury and congressional investigation, of lying about getting an alleged $135,000 kickback, and of engaging in a scheme to deprive citizens of the “honest services” of their elected officials.

The most serious charge, involving wire fraud, carries a possible prison sentence of up to 20 years.