The Milwaukee Brewers, after a massive weekend shakeup in which their general manager resigned and their manager and player development chief were fired, confirmed tonight they have hired Harry I. Dalton of the California Angels as general manager.

Dalton has been general manager of the Angels since 1971 and developed an American League baseball dynasty while in a comparable position with the Baltimore Orioles in the late 1960s and early 1970s. He is to take over immediately and is to be introduced at a news conference here Monday, the Brewers said.

THe Brewers, in a hastily prepared statement confirmed the firings of manager Ales Grammas and director of player development Al Widnar. The club also said Jim Baumer resigned as director of baseball operation, the club's description of the general managership.

Baumer has been offered another job in the area of scouting and player development.

Selig said today the decision capped "months of long and agonizing thought."

The Associated Press learned that Baumer, Grammas and Widmar were informed of the decision Friday, shortly after the Brewers had called a news conference to introduce American League runs-batted-in champion Larry Hisle, former Minnesota Twins outfielder, who signed a multi-year contract.

"We are grieved by the whole situation, but we concluded after months of long and agonizing thought that it simply was time for a change," Selig said.

Selig would not confirm that Baumer's successor would be Dalton, but reliable sources said his appointment would be announced this week, possibly as early as Monday.

Dalton joined the Baltimore organization in 1953 and was named the Orioles' player personnel director in 1965. During his six years in the capacity, the Orioles won four American League pennants and two World Series. He was named major league executive of the year in 1970.

Falton joined the California Angels on Oct. 27, 1971, as general manager. The Angels spent an estimated $6 million a year ago to sign free agents Joe Rudi, Bobby Grich and Don Baylor, but were a major disappointment last season, largely because of injuries.

The Angels' failure to contend for the American League West championship last season cost Dalton his position of influence with the club. Angels owner Gene Autry hired Buzzie Bevasi, longtime Los Angeles Dodgers' general manager, as an assistant several weeks ago.