Glenwood S. Troop Jr., 58, legislative director and staff vice president of the U.S. League of Savings Associations, died Aug. 4 at Alexandria Hospital after a heart attack. He lived in Alexandria.

As chief lobbyist of the savings and loan industry, Mr. Troop had been involved in the industry's efforts at blocking the present administration's proposals for bank deregulation. In an article in the July issue of Dun's Business Month on the thrift industry's Capitol Hill lobbying team, Mr. Troop was described as " . . . the most famous member of the team . . . the U.S. League's top congressional operative.

"After thirty years on the Hill, Mr. Troop is well known and respected in spite of--if not because--of his straight talk, salty language and stubborn refusal to wear a tie or talk to reporters.

" 'Why, he's been around even longer than (House Banking Committee Chairman) St. Germain, and that counts in this town,' says one Hill observer. 'He knows how every law was written, and where all the bodies are buried,' " the article said.

Mr. Troop joined the U.S. League's predecessor, the old U.S. Savings & Loan League in Washington, in 1952.

He was born in Cambridge, Mass., and reared in Norfolk, Va. He served in the Pacific during World War II as a Marine Corps sergeant. He graduated from the University of Maryland and attended Georgetown University law school.

Survivors include his wife, the former Anne Brinkley, of Glen Burnie; a son, Michael G., of Alexandria, and a daughter, Patricia Anne Wharton of Rockville.