However , the club lost its major rival , Allegheny , in 1896 when the Amateur Athletic Union suspended the Allegheny team for its flagrant violations of amateur rules .
Pittsburgh continued to play until 1901 .
The club lost Pittsburgh 's major rival , Allegheny , in 1896 when the Amateur Athletic Union suspended the Allegheny team for its flagrant violations of amateur rules .
Pittsburgh continued to play until 1901 .