For a long time now it had been rumored that Ultimate Warrior demanded money from Vince McMahon prior to the 1991 WWE Summerslam PPV, and the situation was described as Warrior "holding up" WWE for more money prior to the PPV. Following the PPV, Vince suspended Warrior, who remained under contract to WWE until 1992.
The letter from Warrior to Vince and Vince's subsequent response letter have surfaced online, and can be viewed in PDF form at this link and at this link.
https://docs.google.com/file/d/0B-NNkZSWAAYlMDMyQ1VIVVMxaUk/preview?pli=1
https://drive.google.com/file/d/0B-NNkZSWAAYlT3NEZ1puVkpLakk/preview?pli=1