The Graysons Circus - Earth 3 - Justice League

Originally owned by Anthony Zucco, the Graysons Circus was inherited by the Flying Graysons after he was murdered by John Grayson. 

Coercing many of the acts to join them through blackmail, the circus served as a front for the Graysons' money-laundering operations. 

Often travelling through Gotham, they regularly worked with Owlman. 

Following the deaths of the Graysons, the circus was placed under new management.