India's Sree Santh has been fined 50% of his match fee after barging England captain Michael Vaughan in the second Test at Trent Bridge.
Santh's clash with Vaughan proved costly
Santh admitted breaching the ICC Code of Conduct after a Level 2 charge brought against him by match officials.
Match referee Ranjan Madugalle said: "Cricket is a non-contact sport and any deviation from that is unacceptable.
"I have no problem with players being combative but there is a line they cannot cross and Santh crossed it."
Madugalle added: "I am pleased that Santh accepted he was in the wrong by pleading guilty and that he apologised for his actions and I hope he learns from his mistake."
The match has been marred by several unsavoury incidents, including sledging, since the start of the Test on Friday.
Santh was also accused of running through the crease and bowling a beamer at Kevin Pietersen while Zaheer Khan accused England players of insulting behaviour by dropping jelly beans on the wicket when he was batting on Sunday.
I ask myself why do people carry on abusing players when they're batting
Former England batsman Geoff Boycott blamed the ICC for not setting out clear guidelines for officials before matters came to a head.
"The ICC are to blame for not telling umpires to be much firmer with the players. They are the guardians of the game, they run it," he told BBC Radio Five Live.
"You bowl a beamer, it can slip out of your hands, he said sorry and I accept that. You can be cynical and say he meant it but I don't accept that.
"What I don't accept is when he runs a yard through the crease, that's deliberate, and the umpire should have got hold of the captain straight away and said 'I'm not having it, if he does it again he's off, he's not bowling again'."
Boycott would also like to see an end to sledging, or on-field verbal abuse, insisting he was never subjected to it during his time as Test batsman.
"With verbals, I ask myself why do people carry on abusing players when they're batting," he said.
"It can only be because they are frustrated they can't get him out because he is batted in, or they think he's a new batsman they're not going to get out and they want to upset him.
"I never had it in my day and I faced some of the greatest bowlers there has ever been."