FIFPro General Secretary Theo van Seggelen (pictured) also said in an interview that players should remain anonymous when reporting approaches from match-fixers and that over-zealous anti-doping rules were "like trying to kill a fly with a Kalashnikov."
Van Seggelen said Eastern Europe had become a black spot for players' rights and, with Russia to host the 2018 World Cup, the old excuse - that things are done differently there - was no longer good enough.
FIFPro was working on a so-called "black book" aimed at shaming offenders by listing cases of non-payment of wages and maltreatment of players, he said.
"It has to do with the mentality in these countries," Van Seggelen told Reuters. "They still they think own the players and can do what they want.
"But they cannot keep telling us that in Eastern Europe everything is different and we have to accept that. They also play with 11 players, and have to follow the same rules."
"In seven years, we will have the World Cup in Russia. Several countries are EU members, others will join soon and we cannot longer accept that these players do not have any rights.
"We have lost our patience with them, the only thing we can do is show the world. We told [UEFA President] Michel Platini that we want to help improve the game but you cannot make a difference between Western and Eastern Europe.
"I have been to Bulgaria, Romania, Russia several times," he added.
"I try to have a dialogue but every time I was on the plane [home] I thought... they treated me very well, they were polite and now they're thinking, OK, he's gone. That is frustrating for me, my staff and all the players we represent.
"The contracts are often ridiculous. It's quite usual to pay under the table.
"They say players don't have to pay taxes but it is a ridiculous argument because if you have a contract with a minimum salary and the rest is under the table, you also have no security."
"Then there is the treatment of players. If a player is not performing well, they try to get rid of him."
Another common practice was to make players train separately, he said. In one case. a player in Serbia was made to train twice a day - once at seven o'clock in the morning and once at midnight - after deciding he did not want to renew his contract.
He was also evicted from the hotel where he had been staying.
SIMPLE ANSWER
"The solution is very simple; implementation of the minimum requirements, same standard contracts with fair play. The solutions are easy to find but first you must have the guts to take sanctions against countries," said Van Seggelen.
Such conditions also made the risk of match-fixing, which has become a major worldwide concern, more likely in the region.
"I can imagine that if you have not received your salary for nine months, and somebody says you can earn five times your salary... a player in this situation is v
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