Muhammed Tahir (53), had been banned from travelling on the London Underground as he rubbed himself against a young commuter on the tube.
The 53-year-old dry cleaner had followered the young commuter on to a Central Line train, after having spotted her on the platform.
He then veered towards the victim, who was in her 20s, and slide his hand across her thigh as she stood with other passengers, pretending that it was by mistake.
As the victim tried to move away, he would move even closer and began to rub his potbelly and crotch on her bottom.
During his vulgar actions, Tahir was not aware of undercover police officers, who were watching his every move.
The Old Bailey were told about how the undercover police officers first saw Tahir when he got off his train at Mile End at around 8am on 24 July 2014.
The distressed woman had managed to attract the attention of one of the officers, which led to the arrest of Tahir.
Detectives also later detected that Tahir was charged with two similar offences in 2003, only to be cleared after the prosecution file failed to arrive in court in time.
Judge Rebecca Poulet QC, ordered order to tackle his problems under the supervision of probation officers.
Tahir was sentenced to 26 weeks imprisonment, suspended for two years with 12 months supervision as well as 150 hours of unpaid work.
