Various models work on blacklisting and whitelisting principles. Spamhaus responded by blacklisting all of A2B address space. Her testimony against Hanns resulted in his blacklisting and deportation. We have a zero tolerance policy towards blacklisting, illegal or unfair recruitment practices. Rosa Parks left Montgomery due to death threats and employment blacklisting. This led to his blacklisting in Czechoslovakia and his works being banned there. Guangdong Environmental Protection Bureau took a stance against the companies by blacklisting them. In 2012, Crossrail faced accusations of blacklisting. Further allegations of blacklisting against Crossrail were made in Parliament in September 2017. The blacklisting has since been rescinded. Some private trackers responded to this by blacklisting version 0.60. To make blacklisting effective, the IMEI number is supposed to be difficult to change. Almost alone among the many victims of blacklisting, Faulk decided to sue AWARE in 1957. BitComet developer RnySmile reverted the client back to version 0.59 in response to the blacklisting. This would typically include quoting a password chosen at the time of blacklisting.