After the Bucks' first season in 1968-1969, they had the first pick of the NBA draft. They used it to draft a young player named Lew Alcindor.
You may know him better as Kareem Abdul-Jabbar, the NBA's all-time scoring leader.
In his first season with the Bucks, he averaged nearly 29 points and 15 rebounds per game in a Rookie of the Year bid.
In his second season with the Bucks, he aided the Bucks in winning the NBA championship.
But after six successful seasons with the Bucks, Kareem decided Milwaukee was not meeting his cultural needs. He demanded a trade for that reason, and the Bucks reluctantly traded him to the the Los Angles Lakers...where Kareem went on to win five more NBA championships to the Bucks' zero.
The Bucks picked up some decent players in the trade, but none of which came close to having the impact on the team that Kareem did.
Potentially more critical was the message this action sent out to the rest of the players in the NBA. His opinion and desire to leave Milwaukee portrayed the city poorly, and we can never know how big of an impact this truly had on the Milwaukee Bucks franchise in terms of league perception.